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diff --git a/addons/point_of_sale/models/pos_session.py b/addons/point_of_sale/models/pos_session.py
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+++ b/addons/point_of_sale/models/pos_session.py
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+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from collections import defaultdict
+from datetime import timedelta
+
+from odoo import api, fields, models, _
+from odoo.exceptions import AccessError, UserError, ValidationError
+from odoo.tools import float_is_zero, float_compare
+
+
+class PosSession(models.Model):
+    _name = 'pos.session'
+    _order = 'id desc'
+    _description = 'Point of Sale Session'
+    _inherit = ['mail.thread', 'mail.activity.mixin']
+
+    POS_SESSION_STATE = [
+        ('opening_control', 'Opening Control'),  # method action_pos_session_open
+        ('opened', 'In Progress'),               # method action_pos_session_closing_control
+        ('closing_control', 'Closing Control'),  # method action_pos_session_close
+        ('closed', 'Closed & Posted'),
+    ]
+
+    company_id = fields.Many2one('res.company', related='config_id.company_id', string="Company", readonly=True)
+
+    config_id = fields.Many2one(
+        'pos.config', string='Point of Sale',
+        help="The physical point of sale you will use.",
+        required=True,
+        index=True)
+    name = fields.Char(string='Session ID', required=True, readonly=True, default='/')
+    user_id = fields.Many2one(
+        'res.users', string='Opened By',
+        required=True,
+        index=True,
+        readonly=True,
+        states={'opening_control': [('readonly', False)]},
+        default=lambda self: self.env.uid,
+        ondelete='restrict')
+    currency_id = fields.Many2one('res.currency', related='config_id.currency_id', string="Currency", readonly=False)
+    start_at = fields.Datetime(string='Opening Date', readonly=True)
+    stop_at = fields.Datetime(string='Closing Date', readonly=True, copy=False)
+
+    state = fields.Selection(
+        POS_SESSION_STATE, string='Status',
+        required=True, readonly=True,
+        index=True, copy=False, default='opening_control')
+
+    sequence_number = fields.Integer(string='Order Sequence Number', help='A sequence number that is incremented with each order', default=1)
+    login_number = fields.Integer(string='Login Sequence Number', help='A sequence number that is incremented each time a user resumes the pos session', default=0)
+
+    cash_control = fields.Boolean(compute='_compute_cash_all', string='Has Cash Control', compute_sudo=True)
+    cash_journal_id = fields.Many2one('account.journal', compute='_compute_cash_all', string='Cash Journal', store=True)
+    cash_register_id = fields.Many2one('account.bank.statement', compute='_compute_cash_all', string='Cash Register', store=True)
+
+    cash_register_balance_end_real = fields.Monetary(
+        related='cash_register_id.balance_end_real',
+        string="Ending Balance",
+        help="Total of closing cash control lines.",
+        readonly=True)
+    cash_register_balance_start = fields.Monetary(
+        related='cash_register_id.balance_start',
+        string="Starting Balance",
+        help="Total of opening cash control lines.",
+        readonly=True)
+    cash_register_total_entry_encoding = fields.Monetary(
+        compute='_compute_cash_balance',
+        string='Total Cash Transaction',
+        readonly=True,
+        help="Total of all paid sales orders")
+    cash_register_balance_end = fields.Monetary(
+        compute='_compute_cash_balance',
+        string="Theoretical Closing Balance",
+        help="Sum of opening balance and transactions.",
+        readonly=True)
+    cash_register_difference = fields.Monetary(
+        compute='_compute_cash_balance',
+        string='Before Closing Difference',
+        help="Difference between the theoretical closing balance and the real closing balance.",
+        readonly=True)
+    cash_real_difference = fields.Monetary(string='Difference', readonly=True)
+    cash_real_transaction = fields.Monetary(string='Transaction', readonly=True)
+    cash_real_expected = fields.Monetary(string="Expected", readonly=True)
+
+    order_ids = fields.One2many('pos.order', 'session_id',  string='Orders')
+    order_count = fields.Integer(compute='_compute_order_count')
+    statement_ids = fields.One2many('account.bank.statement', 'pos_session_id', string='Cash Statements', readonly=True)
+    failed_pickings = fields.Boolean(compute='_compute_picking_count')
+    picking_count = fields.Integer(compute='_compute_picking_count')
+    picking_ids = fields.One2many('stock.picking', 'pos_session_id')
+    rescue = fields.Boolean(string='Recovery Session',
+        help="Auto-generated session for orphan orders, ignored in constraints",
+        readonly=True,
+        copy=False)
+    move_id = fields.Many2one('account.move', string='Journal Entry')
+    payment_method_ids = fields.Many2many('pos.payment.method', related='config_id.payment_method_ids', string='Payment Methods')
+    total_payments_amount = fields.Float(compute='_compute_total_payments_amount', string='Total Payments Amount')
+    is_in_company_currency = fields.Boolean('Is Using Company Currency', compute='_compute_is_in_company_currency')
+    update_stock_at_closing = fields.Boolean('Stock should be updated at closing')
+
+    _sql_constraints = [('uniq_name', 'unique(name)', "The name of this POS Session must be unique !")]
+
+    @api.depends('currency_id', 'company_id.currency_id')
+    def _compute_is_in_company_currency(self):
+        for session in self:
+            session.is_in_company_currency = session.currency_id == session.company_id.currency_id
+
+    @api.depends('payment_method_ids', 'order_ids', 'cash_register_balance_start', 'cash_register_id')
+    def _compute_cash_balance(self):
+        for session in self:
+            cash_payment_method = session.payment_method_ids.filtered('is_cash_count')[:1]
+            if cash_payment_method:
+                total_cash_payment = 0.0
+                result = self.env['pos.payment'].read_group([('session_id', '=', session.id), ('payment_method_id', '=', cash_payment_method.id)], ['amount'], ['session_id'])
+                if result:
+                    total_cash_payment = result[0]['amount']
+                session.cash_register_total_entry_encoding = session.cash_register_id.total_entry_encoding + (
+                    0.0 if session.state == 'closed' else total_cash_payment
+                )
+                session.cash_register_balance_end = session.cash_register_balance_start + session.cash_register_total_entry_encoding
+                session.cash_register_difference = session.cash_register_balance_end_real - session.cash_register_balance_end
+            else:
+                session.cash_register_total_entry_encoding = 0.0
+                session.cash_register_balance_end = 0.0
+                session.cash_register_difference = 0.0
+
+    @api.depends('order_ids.payment_ids.amount')
+    def _compute_total_payments_amount(self):
+        result = self.env['pos.payment'].read_group([('session_id', 'in', self.ids)], ['amount'], ['session_id'])
+        session_amount_map = dict((data['session_id'][0], data['amount']) for data in result)
+        for session in self:
+            session.total_payments_amount = session_amount_map.get(session.id) or 0
+
+    def _compute_order_count(self):
+        orders_data = self.env['pos.order'].read_group([('session_id', 'in', self.ids)], ['session_id'], ['session_id'])
+        sessions_data = {order_data['session_id'][0]: order_data['session_id_count'] for order_data in orders_data}
+        for session in self:
+            session.order_count = sessions_data.get(session.id, 0)
+
+    @api.depends('picking_ids', 'picking_ids.state')
+    def _compute_picking_count(self):
+        for session in self:
+            session.picking_count = self.env['stock.picking'].search_count([('pos_session_id', '=', session.id)])
+            session.failed_pickings = bool(self.env['stock.picking'].search([('pos_session_id', '=', session.id), ('state', '!=', 'done')], limit=1))
+
+    def action_stock_picking(self):
+        self.ensure_one()
+        action = self.env['ir.actions.act_window']._for_xml_id('stock.action_picking_tree_ready')
+        action['context'] = {}
+        action['domain'] = [('id', 'in', self.picking_ids.ids)]
+        return action
+
+    @api.depends('config_id', 'statement_ids', 'payment_method_ids')
+    def _compute_cash_all(self):
+        # Only one cash register is supported by point_of_sale.
+        for session in self:
+            session.cash_journal_id = session.cash_register_id = session.cash_control = False
+            cash_payment_methods = session.payment_method_ids.filtered('is_cash_count')
+            if not cash_payment_methods:
+                continue
+            for statement in session.statement_ids:
+                if statement.journal_id == cash_payment_methods[0].cash_journal_id:
+                    session.cash_control = session.config_id.cash_control
+                    session.cash_journal_id = statement.journal_id.id
+                    session.cash_register_id = statement.id
+                    break  # stop iteration after finding the cash journal
+
+    @api.constrains('config_id')
+    def _check_pos_config(self):
+        if self.search_count([
+                ('state', '!=', 'closed'),
+                ('config_id', '=', self.config_id.id),
+                ('rescue', '=', False)
+            ]) > 1:
+            raise ValidationError(_("Another session is already opened for this point of sale."))
+
+    @api.constrains('start_at')
+    def _check_start_date(self):
+        for record in self:
+            company = record.config_id.journal_id.company_id
+            start_date = record.start_at.date()
+            if (company.period_lock_date and start_date <= company.period_lock_date) or (company.fiscalyear_lock_date and start_date <= company.fiscalyear_lock_date):
+                raise ValidationError(_("You cannot create a session before the accounting lock date."))
+
+    def _check_bank_statement_state(self):
+        for session in self:
+            closed_statement_ids = session.statement_ids.filtered(lambda x: x.state != "open")
+            if closed_statement_ids:
+                raise UserError(_("Some Cash Registers are already posted. Please reset them to new in order to close the session.\n"
+                                  "Cash Registers: %r", list(statement.name for statement in closed_statement_ids)))
+
+    @api.model
+    def create(self, values):
+        config_id = values.get('config_id') or self.env.context.get('default_config_id')
+        if not config_id:
+            raise UserError(_("You should assign a Point of Sale to your session."))
+
+        # journal_id is not required on the pos_config because it does not
+        # exists at the installation. If nothing is configured at the
+        # installation we do the minimal configuration. Impossible to do in
+        # the .xml files as the CoA is not yet installed.
+        pos_config = self.env['pos.config'].browse(config_id)
+        ctx = dict(self.env.context, company_id=pos_config.company_id.id)
+
+        pos_name = self.env['ir.sequence'].with_context(ctx).next_by_code('pos.session')
+        if values.get('name'):
+            pos_name += ' ' + values['name']
+
+        cash_payment_methods = pos_config.payment_method_ids.filtered(lambda pm: pm.is_cash_count)
+        statement_ids = self.env['account.bank.statement']
+        if self.user_has_groups('point_of_sale.group_pos_user'):
+            statement_ids = statement_ids.sudo()
+        for cash_journal in cash_payment_methods.mapped('cash_journal_id'):
+            ctx['journal_id'] = cash_journal.id if pos_config.cash_control and cash_journal.type == 'cash' else False
+            st_values = {
+                'journal_id': cash_journal.id,
+                'user_id': self.env.user.id,
+                'name': pos_name,
+            }
+            statement_ids |= statement_ids.with_context(ctx).create(st_values)
+
+        update_stock_at_closing = pos_config.company_id.point_of_sale_update_stock_quantities == "closing"
+
+        values.update({
+            'name': pos_name,
+            'statement_ids': [(6, 0, statement_ids.ids)],
+            'config_id': config_id,
+            'update_stock_at_closing': update_stock_at_closing,
+        })
+
+        if self.user_has_groups('point_of_sale.group_pos_user'):
+            res = super(PosSession, self.with_context(ctx).sudo()).create(values)
+        else:
+            res = super(PosSession, self.with_context(ctx)).create(values)
+        res.action_pos_session_open()
+
+        return res
+
+    def unlink(self):
+        for session in self.filtered(lambda s: s.statement_ids):
+            session.statement_ids.unlink()
+        return super(PosSession, self).unlink()
+
+    def login(self):
+        self.ensure_one()
+        login_number = self.login_number + 1
+        self.write({
+            'login_number': login_number,
+        })
+        return login_number
+
+    def action_pos_session_open(self):
+        # second browse because we need to refetch the data from the DB for cash_register_id
+        # we only open sessions that haven't already been opened
+        for session in self.filtered(lambda session: session.state in ('new_session', 'opening_control')):
+            values = {}
+            if not session.start_at:
+                values['start_at'] = fields.Datetime.now()
+            if session.config_id.cash_control and not session.rescue:
+                last_sessions = self.env['pos.session'].search([('config_id', '=', self.config_id.id)]).ids
+                # last session includes the new one already.
+                self.cash_register_id.balance_start = self.env['pos.session'].browse(last_sessions[1]).cash_register_id.balance_end_real if len(last_sessions) > 1 else 0
+                values['state'] = 'opening_control'
+            else:
+                values['state'] = 'opened'
+            session.write(values)
+        return True
+
+    def action_pos_session_closing_control(self):
+        self._check_pos_session_balance()
+        for session in self:
+            if any(order.state == 'draft' for order in session.order_ids):
+                raise UserError(_("You cannot close the POS when orders are still in draft"))
+            if session.state == 'closed':
+                raise UserError(_('This session is already closed.'))
+            session.write({'state': 'closing_control', 'stop_at': fields.Datetime.now()})
+            if not session.config_id.cash_control:
+                session.action_pos_session_close()
+
+    def _check_pos_session_balance(self):
+        for session in self:
+            for statement in session.statement_ids:
+                if (statement != session.cash_register_id) and (statement.balance_end != statement.balance_end_real):
+                    statement.write({'balance_end_real': statement.balance_end})
+
+    def action_pos_session_validate(self):
+        self._check_pos_session_balance()
+        return self.action_pos_session_close()
+
+    def action_pos_session_close(self):
+        # Session without cash payment method will not have a cash register.
+        # However, there could be other payment methods, thus, session still
+        # needs to be validated.
+        self._check_bank_statement_state()
+        if not self.cash_register_id:
+            return self._validate_session()
+
+        if self.cash_control and abs(self.cash_register_difference) > self.config_id.amount_authorized_diff:
+            # Only pos manager can close statements with cash_register_difference greater than amount_authorized_diff.
+            if not self.user_has_groups("point_of_sale.group_pos_manager"):
+                raise UserError(_(
+                    "Your ending balance is too different from the theoretical cash closing (%.2f), "
+                    "the maximum allowed is: %.2f. You can contact your manager to force it."
+                ) % (self.cash_register_difference, self.config_id.amount_authorized_diff))
+            else:
+                return self._warning_balance_closing()
+        else:
+            return self._validate_session()
+
+    def _validate_session(self):
+        self.ensure_one()
+        sudo = self.user_has_groups('point_of_sale.group_pos_user')
+        if self.order_ids or self.statement_ids.line_ids:
+            self.cash_real_transaction = self.cash_register_total_entry_encoding
+            self.cash_real_expected = self.cash_register_balance_end
+            self.cash_real_difference = self.cash_register_difference
+            if self.state == 'closed':
+                raise UserError(_('This session is already closed.'))
+            self._check_if_no_draft_orders()
+            if self.update_stock_at_closing:
+                self._create_picking_at_end_of_session()
+            # Users without any accounting rights won't be able to create the journal entry. If this
+            # case, switch to sudo for creation and posting.
+            try:
+                self.with_company(self.company_id)._create_account_move()
+            except AccessError as e:
+                if sudo:
+                    self.sudo().with_company(self.company_id)._create_account_move()
+                else:
+                    raise e
+            if self.move_id.line_ids:
+                # Set the uninvoiced orders' state to 'done'
+                self.env['pos.order'].search([('session_id', '=', self.id), ('state', '=', 'paid')]).write({'state': 'done'})
+            else:
+                self.move_id.unlink()
+        else:
+            statement = self.cash_register_id
+            if not self.config_id.cash_control:
+                statement.write({'balance_end_real': statement.balance_end})
+            statement.button_post()
+            statement.button_validate()
+        self.write({'state': 'closed'})
+        return {
+            'type': 'ir.actions.client',
+            'name': 'Point of Sale Menu',
+            'tag': 'reload',
+            'params': {'menu_id': self.env.ref('point_of_sale.menu_point_root').id},
+        }
+
+    def _create_picking_at_end_of_session(self):
+        self.ensure_one()
+        lines_grouped_by_dest_location = {}
+        picking_type = self.config_id.picking_type_id
+
+        if not picking_type or not picking_type.default_location_dest_id:
+            session_destination_id = self.env['stock.warehouse']._get_partner_locations()[0].id
+        else:
+            session_destination_id = picking_type.default_location_dest_id.id
+
+        for order in self.order_ids:
+            if order.company_id.anglo_saxon_accounting and order.is_invoiced:
+                continue
+            destination_id = order.partner_id.property_stock_customer.id or session_destination_id
+            if destination_id in lines_grouped_by_dest_location:
+                lines_grouped_by_dest_location[destination_id] |= order.lines
+            else:
+                lines_grouped_by_dest_location[destination_id] = order.lines
+
+        for location_dest_id, lines in lines_grouped_by_dest_location.items():
+            pickings = self.env['stock.picking']._create_picking_from_pos_order_lines(location_dest_id, lines, picking_type)
+            pickings.write({'pos_session_id': self.id, 'origin': self.name})
+
+    def _create_balancing_line(self, data):
+        imbalance_amount = 0
+        for line in self.move_id.line_ids:
+            # it is an excess debit so it should be credited
+            imbalance_amount += line.debit - line.credit
+
+        if (not float_is_zero(imbalance_amount, precision_rounding=self.currency_id.rounding)):
+            balancing_vals = self._prepare_balancing_line_vals(imbalance_amount, self.move_id)
+            MoveLine = data.get('MoveLine')
+            MoveLine.create(balancing_vals)
+
+        return data
+
+    def _prepare_balancing_line_vals(self, imbalance_amount, move):
+        account = self._get_balancing_account()
+        partial_vals = {
+            'name': _('Difference at closing PoS session'),
+            'account_id': account.id,
+            'move_id': move.id,
+            'partner_id': False,
+        }
+        # `imbalance_amount` is already in terms of company currency so it is the amount_converted
+        # param when calling `_credit_amounts`. amount param will be the converted value of
+        # `imbalance_amount` from company currency to the session currency.
+        imbalance_amount_session = 0
+        if (not self.is_in_company_currency):
+            imbalance_amount_session = self.company_id.currency_id._convert(imbalance_amount, self.currency_id, self.company_id, fields.Date.context_today(self))
+        return self._credit_amounts(partial_vals, imbalance_amount_session, imbalance_amount)
+
+    def _get_balancing_account(self):
+        propoerty_account = self.env['ir.property']._get('property_account_receivable_id', 'res.partner')
+        return self.company_id.account_default_pos_receivable_account_id or propoerty_account or self.env['account.account']
+
+    def _create_account_move(self):
+        """ Create account.move and account.move.line records for this session.
+
+        Side-effects include:
+            - setting self.move_id to the created account.move record
+            - creating and validating account.bank.statement for cash payments
+            - reconciling cash receivable lines, invoice receivable lines and stock output lines
+        """
+        journal = self.config_id.journal_id
+        # Passing default_journal_id for the calculation of default currency of account move
+        # See _get_default_currency in the account/account_move.py.
+        account_move = self.env['account.move'].with_context(default_journal_id=journal.id).create({
+            'journal_id': journal.id,
+            'date': fields.Date.context_today(self),
+            'ref': self.name,
+        })
+        self.write({'move_id': account_move.id})
+
+        data = {}
+        data = self._accumulate_amounts(data)
+        data = self._create_non_reconciliable_move_lines(data)
+        data = self._create_cash_statement_lines_and_cash_move_lines(data)
+        data = self._create_invoice_receivable_lines(data)
+        data = self._create_stock_output_lines(data)
+        data = self._create_balancing_line(data)
+
+        if account_move.line_ids:
+            account_move._post()
+
+        data = self._reconcile_account_move_lines(data)
+
+    def _accumulate_amounts(self, data):
+        # Accumulate the amounts for each accounting lines group
+        # Each dict maps `key` -> `amounts`, where `key` is the group key.
+        # E.g. `combine_receivables` is derived from pos.payment records
+        # in the self.order_ids with group key of the `payment_method_id`
+        # field of the pos.payment record.
+        amounts = lambda: {'amount': 0.0, 'amount_converted': 0.0}
+        tax_amounts = lambda: {'amount': 0.0, 'amount_converted': 0.0, 'base_amount': 0.0, 'base_amount_converted': 0.0}
+        split_receivables = defaultdict(amounts)
+        split_receivables_cash = defaultdict(amounts)
+        combine_receivables = defaultdict(amounts)
+        combine_receivables_cash = defaultdict(amounts)
+        invoice_receivables = defaultdict(amounts)
+        sales = defaultdict(amounts)
+        taxes = defaultdict(tax_amounts)
+        stock_expense = defaultdict(amounts)
+        stock_return = defaultdict(amounts)
+        stock_output = defaultdict(amounts)
+        rounding_difference = {'amount': 0.0, 'amount_converted': 0.0}
+        # Track the receivable lines of the invoiced orders' account moves for reconciliation
+        # These receivable lines are reconciled to the corresponding invoice receivable lines
+        # of this session's move_id.
+        order_account_move_receivable_lines = defaultdict(lambda: self.env['account.move.line'])
+        rounded_globally = self.company_id.tax_calculation_rounding_method == 'round_globally'
+        for order in self.order_ids:
+            # Combine pos receivable lines
+            # Separate cash payments for cash reconciliation later.
+            for payment in order.payment_ids:
+                amount, date = payment.amount, payment.payment_date
+                if payment.payment_method_id.split_transactions:
+                    if payment.payment_method_id.is_cash_count:
+                        split_receivables_cash[payment] = self._update_amounts(split_receivables_cash[payment], {'amount': amount}, date)
+                    else:
+                        split_receivables[payment] = self._update_amounts(split_receivables[payment], {'amount': amount}, date)
+                else:
+                    key = payment.payment_method_id
+                    if payment.payment_method_id.is_cash_count:
+                        combine_receivables_cash[key] = self._update_amounts(combine_receivables_cash[key], {'amount': amount}, date)
+                    else:
+                        combine_receivables[key] = self._update_amounts(combine_receivables[key], {'amount': amount}, date)
+
+            if order.is_invoiced:
+                # Combine invoice receivable lines
+                key = order.partner_id
+                if self.config_id.cash_rounding:
+                    invoice_receivables[key] = self._update_amounts(invoice_receivables[key], {'amount': order.amount_paid}, order.date_order)
+                else:
+                    invoice_receivables[key] = self._update_amounts(invoice_receivables[key], {'amount': order.amount_total}, order.date_order)
+                # side loop to gather receivable lines by account for reconciliation
+                for move_line in order.account_move.line_ids.filtered(lambda aml: aml.account_id.internal_type == 'receivable' and not aml.reconciled):
+                    order_account_move_receivable_lines[move_line.account_id.id] |= move_line
+            else:
+                order_taxes = defaultdict(tax_amounts)
+                for order_line in order.lines:
+                    line = self._prepare_line(order_line)
+                    # Combine sales/refund lines
+                    sale_key = (
+                        # account
+                        line['income_account_id'],
+                        # sign
+                        -1 if line['amount'] < 0 else 1,
+                        # for taxes
+                        tuple((tax['id'], tax['account_id'], tax['tax_repartition_line_id']) for tax in line['taxes']),
+                        line['base_tags'],
+                    )
+                    sales[sale_key] = self._update_amounts(sales[sale_key], {'amount': line['amount']}, line['date_order'])
+                    # Combine tax lines
+                    for tax in line['taxes']:
+                        tax_key = (tax['account_id'], tax['tax_repartition_line_id'], tax['id'], tuple(tax['tag_ids']))
+                        order_taxes[tax_key] = self._update_amounts(
+                            order_taxes[tax_key],
+                            {'amount': tax['amount'], 'base_amount': tax['base']},
+                            tax['date_order'],
+                            round=not rounded_globally
+                        )
+                for tax_key, amounts in order_taxes.items():
+                    if rounded_globally:
+                        amounts = self._round_amounts(amounts)
+                    for amount_key, amount in amounts.items():
+                        taxes[tax_key][amount_key] += amount
+
+                if self.company_id.anglo_saxon_accounting and order.picking_ids.ids:
+                    # Combine stock lines
+                    stock_moves = self.env['stock.move'].sudo().search([
+                        ('picking_id', 'in', order.picking_ids.ids),
+                        ('company_id.anglo_saxon_accounting', '=', True),
+                        ('product_id.categ_id.property_valuation', '=', 'real_time')
+                    ])
+                    for move in stock_moves:
+                        exp_key = move.product_id._get_product_accounts()['expense']
+                        out_key = move.product_id.categ_id.property_stock_account_output_categ_id
+                        amount = -sum(move.sudo().stock_valuation_layer_ids.mapped('value'))
+                        stock_expense[exp_key] = self._update_amounts(stock_expense[exp_key], {'amount': amount}, move.picking_id.date, force_company_currency=True)
+                        if move.location_id.usage == 'customer':
+                            stock_return[out_key] = self._update_amounts(stock_return[out_key], {'amount': amount}, move.picking_id.date, force_company_currency=True)
+                        else:
+                            stock_output[out_key] = self._update_amounts(stock_output[out_key], {'amount': amount}, move.picking_id.date, force_company_currency=True)
+
+                if self.config_id.cash_rounding:
+                    diff = order.amount_paid - order.amount_total
+                    rounding_difference = self._update_amounts(rounding_difference, {'amount': diff}, order.date_order)
+
+                # Increasing current partner's customer_rank
+                partners = (order.partner_id | order.partner_id.commercial_partner_id)
+                partners._increase_rank('customer_rank')
+
+        if self.company_id.anglo_saxon_accounting:
+            global_session_pickings = self.picking_ids.filtered(lambda p: not p.pos_order_id)
+            if global_session_pickings:
+                stock_moves = self.env['stock.move'].sudo().search([
+                    ('picking_id', 'in', global_session_pickings.ids),
+                    ('company_id.anglo_saxon_accounting', '=', True),
+                    ('product_id.categ_id.property_valuation', '=', 'real_time'),
+                ])
+                for move in stock_moves:
+                    exp_key = move.product_id._get_product_accounts()['expense']
+                    out_key = move.product_id.categ_id.property_stock_account_output_categ_id
+                    amount = -sum(move.stock_valuation_layer_ids.mapped('value'))
+                    stock_expense[exp_key] = self._update_amounts(stock_expense[exp_key], {'amount': amount}, move.picking_id.date)
+                    if move.location_id.usage == 'customer':
+                        stock_return[out_key] = self._update_amounts(stock_return[out_key], {'amount': amount}, move.picking_id.date)
+                    else:
+                        stock_output[out_key] = self._update_amounts(stock_output[out_key], {'amount': amount}, move.picking_id.date)
+        MoveLine = self.env['account.move.line'].with_context(check_move_validity=False)
+
+        data.update({
+            'taxes':                               taxes,
+            'sales':                               sales,
+            'stock_expense':                       stock_expense,
+            'split_receivables':                   split_receivables,
+            'combine_receivables':                 combine_receivables,
+            'split_receivables_cash':              split_receivables_cash,
+            'combine_receivables_cash':            combine_receivables_cash,
+            'invoice_receivables':                 invoice_receivables,
+            'stock_return':                        stock_return,
+            'stock_output':                        stock_output,
+            'order_account_move_receivable_lines': order_account_move_receivable_lines,
+            'rounding_difference':                 rounding_difference,
+            'MoveLine':                            MoveLine
+        })
+        return data
+
+    def _create_non_reconciliable_move_lines(self, data):
+        # Create account.move.line records for
+        #   - sales
+        #   - taxes
+        #   - stock expense
+        #   - non-cash split receivables (not for automatic reconciliation)
+        #   - non-cash combine receivables (not for automatic reconciliation)
+        taxes = data.get('taxes')
+        sales = data.get('sales')
+        stock_expense = data.get('stock_expense')
+        split_receivables = data.get('split_receivables')
+        combine_receivables = data.get('combine_receivables')
+        rounding_difference = data.get('rounding_difference')
+        MoveLine = data.get('MoveLine')
+
+        tax_vals = [self._get_tax_vals(key, amounts['amount'], amounts['amount_converted'], amounts['base_amount_converted']) for key, amounts in taxes.items() if amounts['amount']]
+        # Check if all taxes lines have account_id assigned. If not, there are repartition lines of the tax that have no account_id.
+        tax_names_no_account = [line['name'] for line in tax_vals if line['account_id'] == False]
+        if len(tax_names_no_account) > 0:
+            error_message = _(
+                'Unable to close and validate the session.\n'
+                'Please set corresponding tax account in each repartition line of the following taxes: \n%s'
+            ) % ', '.join(tax_names_no_account)
+            raise UserError(error_message)
+        rounding_vals = []
+
+        if not float_is_zero(rounding_difference['amount'], precision_rounding=self.currency_id.rounding) or not float_is_zero(rounding_difference['amount_converted'], precision_rounding=self.currency_id.rounding):
+            rounding_vals = [self._get_rounding_difference_vals(rounding_difference['amount'], rounding_difference['amount_converted'])]
+
+        MoveLine.create(
+            tax_vals
+            + [self._get_sale_vals(key, amounts['amount'], amounts['amount_converted']) for key, amounts in sales.items()]
+            + [self._get_stock_expense_vals(key, amounts['amount'], amounts['amount_converted']) for key, amounts in stock_expense.items()]
+            + [self._get_split_receivable_vals(key, amounts['amount'], amounts['amount_converted']) for key, amounts in split_receivables.items()]
+            + [self._get_combine_receivable_vals(key, amounts['amount'], amounts['amount_converted']) for key, amounts in combine_receivables.items()]
+            + rounding_vals
+        )
+        return data
+
+    def _create_cash_statement_lines_and_cash_move_lines(self, data):
+        # Create the split and combine cash statement lines and account move lines.
+        # Keep the reference by statement for reconciliation.
+        # `split_cash_statement_lines` maps `statement` -> split cash statement lines
+        # `combine_cash_statement_lines` maps `statement` -> combine cash statement lines
+        # `split_cash_receivable_lines` maps `statement` -> split cash receivable lines
+        # `combine_cash_receivable_lines` maps `statement` -> combine cash receivable lines
+        MoveLine = data.get('MoveLine')
+        split_receivables_cash = data.get('split_receivables_cash')
+        combine_receivables_cash = data.get('combine_receivables_cash')
+
+        statements_by_journal_id = {statement.journal_id.id: statement for statement in self.statement_ids}
+        # handle split cash payments
+        split_cash_statement_line_vals = defaultdict(list)
+        split_cash_receivable_vals = defaultdict(list)
+        for payment, amounts in split_receivables_cash.items():
+            statement = statements_by_journal_id[payment.payment_method_id.cash_journal_id.id]
+            split_cash_statement_line_vals[statement].append(self._get_statement_line_vals(statement, payment.payment_method_id.receivable_account_id, amounts['amount'], date=payment.payment_date, partner=payment.pos_order_id.partner_id))
+            split_cash_receivable_vals[statement].append(self._get_split_receivable_vals(payment, amounts['amount'], amounts['amount_converted']))
+        # handle combine cash payments
+        combine_cash_statement_line_vals = defaultdict(list)
+        combine_cash_receivable_vals = defaultdict(list)
+        for payment_method, amounts in combine_receivables_cash.items():
+            if not float_is_zero(amounts['amount'] , precision_rounding=self.currency_id.rounding):
+                statement = statements_by_journal_id[payment_method.cash_journal_id.id]
+                combine_cash_statement_line_vals[statement].append(self._get_statement_line_vals(statement, payment_method.receivable_account_id, amounts['amount']))
+                combine_cash_receivable_vals[statement].append(self._get_combine_receivable_vals(payment_method, amounts['amount'], amounts['amount_converted']))
+        # create the statement lines and account move lines
+        BankStatementLine = self.env['account.bank.statement.line']
+        split_cash_statement_lines = {}
+        combine_cash_statement_lines = {}
+        split_cash_receivable_lines = {}
+        combine_cash_receivable_lines = {}
+        for statement in self.statement_ids:
+            split_cash_statement_lines[statement] = BankStatementLine.create(split_cash_statement_line_vals[statement])
+            combine_cash_statement_lines[statement] = BankStatementLine.create(combine_cash_statement_line_vals[statement])
+            split_cash_receivable_lines[statement] = MoveLine.create(split_cash_receivable_vals[statement])
+            combine_cash_receivable_lines[statement] = MoveLine.create(combine_cash_receivable_vals[statement])
+
+        data.update(
+            {'split_cash_statement_lines':    split_cash_statement_lines,
+             'combine_cash_statement_lines':  combine_cash_statement_lines,
+             'split_cash_receivable_lines':   split_cash_receivable_lines,
+             'combine_cash_receivable_lines': combine_cash_receivable_lines
+             })
+        return data
+
+    def _create_invoice_receivable_lines(self, data):
+        # Create invoice receivable lines for this session's move_id.
+        # Keep reference of the invoice receivable lines because
+        # they are reconciled with the lines in order_account_move_receivable_lines
+        MoveLine = data.get('MoveLine')
+        invoice_receivables = data.get('invoice_receivables')
+
+        invoice_receivable_vals = defaultdict(list)
+        invoice_receivable_lines = {}
+        for partner, amounts in invoice_receivables.items():
+            commercial_partner = partner.commercial_partner_id
+            account_id = commercial_partner.property_account_receivable_id.id
+            invoice_receivable_vals[commercial_partner].append(self._get_invoice_receivable_vals(account_id, amounts['amount'], amounts['amount_converted'], partner=commercial_partner))
+        for commercial_partner, vals in invoice_receivable_vals.items():
+            account_id = commercial_partner.property_account_receivable_id.id
+            receivable_lines = MoveLine.create(vals)
+            for receivable_line in receivable_lines:
+                if (not receivable_line.reconciled):
+                    if account_id not in invoice_receivable_lines:
+                        invoice_receivable_lines[account_id] = receivable_line
+                    else:
+                        invoice_receivable_lines[account_id] |= receivable_line
+
+        data.update({'invoice_receivable_lines': invoice_receivable_lines})
+        return data
+
+    def _create_stock_output_lines(self, data):
+        # Keep reference to the stock output lines because
+        # they are reconciled with output lines in the stock.move's account.move.line
+        MoveLine = data.get('MoveLine')
+        stock_output = data.get('stock_output')
+        stock_return = data.get('stock_return')
+
+        stock_output_vals = defaultdict(list)
+        stock_output_lines = {}
+        for stock_moves in [stock_output, stock_return]:
+            for account, amounts in stock_moves.items():
+                stock_output_vals[account].append(self._get_stock_output_vals(account, amounts['amount'], amounts['amount_converted']))
+
+        for output_account, vals in stock_output_vals.items():
+            stock_output_lines[output_account] = MoveLine.create(vals)
+
+        data.update({'stock_output_lines': stock_output_lines})
+        return data
+
+    def _reconcile_account_move_lines(self, data):
+        # reconcile cash receivable lines
+        split_cash_statement_lines = data.get('split_cash_statement_lines')
+        combine_cash_statement_lines = data.get('combine_cash_statement_lines')
+        split_cash_receivable_lines = data.get('split_cash_receivable_lines')
+        combine_cash_receivable_lines = data.get('combine_cash_receivable_lines')
+        order_account_move_receivable_lines = data.get('order_account_move_receivable_lines')
+        invoice_receivable_lines = data.get('invoice_receivable_lines')
+        stock_output_lines = data.get('stock_output_lines')
+
+        for statement in self.statement_ids:
+            if not self.config_id.cash_control:
+                statement.write({'balance_end_real': statement.balance_end})
+            statement.button_post()
+            all_lines = (
+                  split_cash_statement_lines[statement].mapped('move_id.line_ids').filtered(lambda aml: aml.account_id.internal_type == 'receivable')
+                | combine_cash_statement_lines[statement].mapped('move_id.line_ids').filtered(lambda aml: aml.account_id.internal_type == 'receivable')
+                | split_cash_receivable_lines[statement]
+                | combine_cash_receivable_lines[statement]
+            )
+            accounts = all_lines.mapped('account_id')
+            lines_by_account = [all_lines.filtered(lambda l: l.account_id == account and not l.reconciled) for account in accounts]
+            for lines in lines_by_account:
+                lines.reconcile()
+            # We try to validate the statement after the reconciliation is done
+            # because validating the statement requires each statement line to be
+            # reconciled.
+            # Furthermore, if the validation failed, which is caused by unreconciled
+            # cash difference statement line, we just ignore that. Leaving the statement
+            # not yet validated. Manual reconciliation and validation should be made
+            # by the user in the accounting app.
+            try:
+                statement.button_validate()
+            except UserError:
+                pass
+
+        # reconcile invoice receivable lines
+        for account_id in order_account_move_receivable_lines:
+            ( order_account_move_receivable_lines[account_id]
+            | invoice_receivable_lines.get(account_id, self.env['account.move.line'])
+            ).reconcile()
+
+        # reconcile stock output lines
+        pickings = self.picking_ids.filtered(lambda p: not p.pos_order_id)
+        pickings |= self.order_ids.filtered(lambda o: not o.is_invoiced).mapped('picking_ids')
+        stock_moves = self.env['stock.move'].search([('picking_id', 'in', pickings.ids)])
+        stock_account_move_lines = self.env['account.move'].search([('stock_move_id', 'in', stock_moves.ids)]).mapped('line_ids')
+        for account_id in stock_output_lines:
+            ( stock_output_lines[account_id]
+            | stock_account_move_lines.filtered(lambda aml: aml.account_id == account_id)
+            ).filtered(lambda aml: not aml.reconciled).reconcile()
+        return data
+
+    def _prepare_line(self, order_line):
+        """ Derive from order_line the order date, income account, amount and taxes information.
+
+        These information will be used in accumulating the amounts for sales and tax lines.
+        """
+        def get_income_account(order_line):
+            product = order_line.product_id
+            income_account = product.with_company(order_line.company_id)._get_product_accounts()['income']
+            if not income_account:
+                raise UserError(_('Please define income account for this product: "%s" (id:%d).')
+                                % (product.name, product.id))
+            return order_line.order_id.fiscal_position_id.map_account(income_account)
+
+        tax_ids = order_line.tax_ids_after_fiscal_position\
+                    .filtered(lambda t: t.company_id.id == order_line.order_id.company_id.id)
+        sign = -1 if order_line.qty >= 0 else 1
+        price = sign * order_line.price_unit * (1 - (order_line.discount or 0.0) / 100.0)
+        # The 'is_refund' parameter is used to compute the tax tags. Ultimately, the tags are part
+        # of the key used for summing taxes. Since the POS UI doesn't support the tags, inconsistencies
+        # may arise in 'Round Globally'.
+        check_refund = lambda x: x.qty * x.price_unit < 0
+        if self.company_id.tax_calculation_rounding_method == 'round_globally':
+            is_refund = all(check_refund(line) for line in order_line.order_id.lines)
+        else:
+            is_refund = check_refund(order_line)
+        tax_data = tax_ids.compute_all(price_unit=price, quantity=abs(order_line.qty), currency=self.currency_id, is_refund=is_refund)
+        taxes = tax_data['taxes']
+        # For Cash based taxes, use the account from the repartition line immediately as it has been paid already
+        for tax in taxes:
+            tax_rep = self.env['account.tax.repartition.line'].browse(tax['tax_repartition_line_id'])
+            tax['account_id'] = tax_rep.account_id.id
+        date_order = order_line.order_id.date_order
+        taxes = [{'date_order': date_order, **tax} for tax in taxes]
+        return {
+            'date_order': order_line.order_id.date_order,
+            'income_account_id': get_income_account(order_line).id,
+            'amount': order_line.price_subtotal,
+            'taxes': taxes,
+            'base_tags': tuple(tax_data['base_tags']),
+        }
+
+    def _get_rounding_difference_vals(self, amount, amount_converted):
+        if self.config_id.cash_rounding:
+            partial_args = {
+                'name': 'Rounding line',
+                'move_id': self.move_id.id,
+            }
+            if float_compare(0.0, amount, precision_rounding=self.currency_id.rounding) > 0:    # loss
+                partial_args['account_id'] = self.config_id.rounding_method.loss_account_id.id
+                return self._debit_amounts(partial_args, -amount, -amount_converted)
+
+            if float_compare(0.0, amount, precision_rounding=self.currency_id.rounding) < 0:   # profit
+                partial_args['account_id'] = self.config_id.rounding_method.profit_account_id.id
+                return self._credit_amounts(partial_args, amount, amount_converted)
+
+    def _get_split_receivable_vals(self, payment, amount, amount_converted):
+        partial_vals = {
+            'account_id': payment.payment_method_id.receivable_account_id.id,
+            'move_id': self.move_id.id,
+            'partner_id': self.env["res.partner"]._find_accounting_partner(payment.partner_id).id,
+            'name': '%s - %s' % (self.name, payment.payment_method_id.name),
+        }
+        return self._debit_amounts(partial_vals, amount, amount_converted)
+
+    def _get_combine_receivable_vals(self, payment_method, amount, amount_converted):
+        partial_vals = {
+            'account_id': payment_method.receivable_account_id.id,
+            'move_id': self.move_id.id,
+            'name': '%s - %s' % (self.name, payment_method.name)
+        }
+        return self._debit_amounts(partial_vals, amount, amount_converted)
+
+    def _get_invoice_receivable_vals(self, account_id, amount, amount_converted, **kwargs):
+        partner = kwargs.get('partner', False)
+        partial_vals = {
+            'account_id': account_id,
+            'move_id': self.move_id.id,
+            'name': 'From invoiced orders',
+            'partner_id': partner and partner.id or False,
+        }
+        return self._credit_amounts(partial_vals, amount, amount_converted)
+
+    def _get_sale_vals(self, key, amount, amount_converted):
+        account_id, sign, tax_keys, base_tag_ids = key
+        tax_ids = set(tax[0] for tax in tax_keys)
+        applied_taxes = self.env['account.tax'].browse(tax_ids)
+        title = 'Sales' if sign == 1 else 'Refund'
+        name = '%s untaxed' % title
+        if applied_taxes:
+            name = '%s with %s' % (title, ', '.join([tax.name for tax in applied_taxes]))
+        partial_vals = {
+            'name': name,
+            'account_id': account_id,
+            'move_id': self.move_id.id,
+            'tax_ids': [(6, 0, tax_ids)],
+            'tax_tag_ids': [(6, 0, base_tag_ids)],
+        }
+        return self._credit_amounts(partial_vals, amount, amount_converted)
+
+    def _get_tax_vals(self, key, amount, amount_converted, base_amount_converted):
+        account_id, repartition_line_id, tax_id, tag_ids = key
+        tax = self.env['account.tax'].browse(tax_id)
+        partial_args = {
+            'name': tax.name,
+            'account_id': account_id,
+            'move_id': self.move_id.id,
+            'tax_base_amount': abs(base_amount_converted),
+            'tax_repartition_line_id': repartition_line_id,
+            'tax_tag_ids': [(6, 0, tag_ids)],
+        }
+        return self._debit_amounts(partial_args, amount, amount_converted)
+
+    def _get_stock_expense_vals(self, exp_account, amount, amount_converted):
+        partial_args = {'account_id': exp_account.id, 'move_id': self.move_id.id}
+        return self._debit_amounts(partial_args, amount, amount_converted, force_company_currency=True)
+
+    def _get_stock_output_vals(self, out_account, amount, amount_converted):
+        partial_args = {'account_id': out_account.id, 'move_id': self.move_id.id}
+        return self._credit_amounts(partial_args, amount, amount_converted, force_company_currency=True)
+
+    def _get_statement_line_vals(self, statement, receivable_account, amount, date=False, partner=False):
+        return {
+            'date': fields.Date.context_today(self, timestamp=date),
+            'amount': amount,
+            'payment_ref': self.name,
+            'statement_id': statement.id,
+            'journal_id': statement.journal_id.id,
+            'counterpart_account_id': receivable_account.id,
+            'partner_id': partner and self.env["res.partner"]._find_accounting_partner(partner).id
+        }
+
+    def _update_amounts(self, old_amounts, amounts_to_add, date, round=True, force_company_currency=False):
+        """Responsible for adding `amounts_to_add` to `old_amounts` considering the currency of the session.
+
+            old_amounts {                                                       new_amounts {
+                amount                         amounts_to_add {                     amount
+                amount_converted        +          amount               ->          amount_converted
+               [base_amount                       [base_amount]                    [base_amount
+                base_amount_converted]        }                                     base_amount_converted]
+            }                                                                   }
+
+        NOTE:
+            - Notice that `amounts_to_add` does not have `amount_converted` field.
+                This function is responsible in calculating the `amount_converted` from the
+                `amount` of `amounts_to_add` which is used to update the values of `old_amounts`.
+            - Values of `amount` and/or `base_amount` should always be in session's currency [1].
+            - Value of `amount_converted` should be in company's currency
+
+        [1] Except when `force_company_currency` = True. It means that values in `amounts_to_add`
+            is in company currency.
+
+        :params old_amounts dict:
+            Amounts to update
+        :params amounts_to_add dict:
+            Amounts used to update the old_amounts
+        :params date date:
+            Date used for conversion
+        :params round bool:
+            Same as round parameter of `res.currency._convert`.
+            Defaults to True because that is the default of `res.currency._convert`.
+            We put it to False if we want to round globally.
+        :params force_company_currency bool:
+            If True, the values in amounts_to_add are in company's currency.
+            Defaults to False because it is only used to anglo-saxon lines.
+
+        :return dict: new amounts combining the values of `old_amounts` and `amounts_to_add`.
+        """
+        # make a copy of the old amounts
+        new_amounts = { **old_amounts }
+
+        amount = amounts_to_add.get('amount')
+        if self.is_in_company_currency or force_company_currency:
+            amount_converted = amount
+        else:
+            amount_converted = self._amount_converter(amount, date, round)
+
+        # update amount and amount converted
+        new_amounts['amount'] += amount
+        new_amounts['amount_converted'] += amount_converted
+
+        # consider base_amount if present
+        if not amounts_to_add.get('base_amount') == None:
+            base_amount = amounts_to_add.get('base_amount')
+            if self.is_in_company_currency or force_company_currency:
+                base_amount_converted = base_amount
+            else:
+                base_amount_converted = self._amount_converter(base_amount, date, round)
+
+            # update base_amount and base_amount_converted
+            new_amounts['base_amount'] += base_amount
+            new_amounts['base_amount_converted'] += base_amount_converted
+
+        return new_amounts
+
+    def _round_amounts(self, amounts):
+        new_amounts = {}
+        for key, amount in amounts.items():
+            if key == 'amount_converted':
+                # round the amount_converted using the company currency.
+                new_amounts[key] = self.company_id.currency_id.round(amount)
+            else:
+                new_amounts[key] = self.currency_id.round(amount)
+        return new_amounts
+
+    def _credit_amounts(self, partial_move_line_vals, amount, amount_converted, force_company_currency=False):
+        """ `partial_move_line_vals` is completed by `credit`ing the given amounts.
+
+        NOTE Amounts in PoS are in the currency of journal_id in the session.config_id.
+        This means that amount fields in any pos record are actually equivalent to amount_currency
+        in account module. Understanding this basic is important in correctly assigning values for
+        'amount' and 'amount_currency' in the account.move.line record.
+
+        :param partial_move_line_vals dict:
+            initial values in creating account.move.line
+        :param amount float:
+            amount derived from pos.payment, pos.order, or pos.order.line records
+        :param amount_converted float:
+            converted value of `amount` from the given `session_currency` to company currency
+
+        :return dict: complete values for creating 'amount.move.line' record
+        """
+        if self.is_in_company_currency or force_company_currency:
+            additional_field = {}
+        else:
+            additional_field = {
+                'amount_currency': -amount,
+                'currency_id': self.currency_id.id,
+            }
+        return {
+            'debit': -amount_converted if amount_converted < 0.0 else 0.0,
+            'credit': amount_converted if amount_converted > 0.0 else 0.0,
+            **partial_move_line_vals,
+            **additional_field,
+        }
+
+    def _debit_amounts(self, partial_move_line_vals, amount, amount_converted, force_company_currency=False):
+        """ `partial_move_line_vals` is completed by `debit`ing the given amounts.
+
+        See _credit_amounts docs for more details.
+        """
+        if self.is_in_company_currency or force_company_currency:
+            additional_field = {}
+        else:
+            additional_field = {
+                'amount_currency': amount,
+                'currency_id': self.currency_id.id,
+            }
+        return {
+            'debit': amount_converted if amount_converted > 0.0 else 0.0,
+            'credit': -amount_converted if amount_converted < 0.0 else 0.0,
+            **partial_move_line_vals,
+            **additional_field,
+        }
+
+    def _amount_converter(self, amount, date, round):
+        # self should be single record as this method is only called in the subfunctions of self._validate_session
+        return self.currency_id._convert(amount, self.company_id.currency_id, self.company_id, date, round=round)
+
+    def show_journal_items(self):
+        self.ensure_one()
+        all_related_moves = self._get_related_account_moves()
+        return {
+            'name': _('Journal Items'),
+            'type': 'ir.actions.act_window',
+            'res_model': 'account.move.line',
+            'view_mode': 'tree',
+            'view_id':self.env.ref('account.view_move_line_tree_grouped').id,
+            'domain': [('id', 'in', all_related_moves.mapped('line_ids').ids)],
+            'context': {
+                'journal_type':'general',
+                'search_default_group_by_move': 1,
+                'group_by':'move_id', 'search_default_posted':1,
+                'name_groupby':1,
+            },
+        }
+
+    def _get_related_account_moves(self):
+        def get_matched_move_lines(aml):
+            if aml.credit > 0:
+                return [r.debit_move_id.id for r in aml.matched_debit_ids]
+            else:
+                return [r.credit_move_id.id for r in aml.matched_credit_ids]
+
+        session_move = self.move_id
+        # get all the linked move lines to this account move.
+        non_reconcilable_lines = session_move.line_ids.filtered(lambda aml: not aml.account_id.reconcile)
+        reconcilable_lines = session_move.line_ids - non_reconcilable_lines
+        fully_reconciled_lines = reconcilable_lines.filtered(lambda aml: aml.full_reconcile_id)
+        partially_reconciled_lines = reconcilable_lines - fully_reconciled_lines
+
+        cash_move_lines = self.env['account.move.line'].search([('statement_id', '=', self.cash_register_id.id)])
+
+        ids = (non_reconcilable_lines.ids
+                + fully_reconciled_lines.mapped('full_reconcile_id').mapped('reconciled_line_ids').ids
+                + sum(partially_reconciled_lines.mapped(get_matched_move_lines), partially_reconciled_lines.ids)
+                + cash_move_lines.ids)
+
+        return self.env['account.move.line'].browse(ids).mapped('move_id')
+
+    def action_show_payments_list(self):
+        return {
+            'name': _('Payments'),
+            'type': 'ir.actions.act_window',
+            'res_model': 'pos.payment',
+            'view_mode': 'tree,form',
+            'domain': [('session_id', '=', self.id)],
+            'context': {'search_default_group_by_payment_method': 1}
+        }
+
+    def open_frontend_cb(self):
+        """Open the pos interface with config_id as an extra argument.
+
+        In vanilla PoS each user can only have one active session, therefore it was not needed to pass the config_id
+        on opening a session. It is also possible to login to sessions created by other users.
+
+        :returns: dict
+        """
+        if not self.ids:
+            return {}
+        return {
+            'type': 'ir.actions.act_url',
+            'target': 'self',
+            'url': self.config_id._get_pos_base_url() + '?config_id=%d' % self.config_id.id,
+        }
+
+    def open_cashbox_pos(self):
+        self.ensure_one()
+        action = self.cash_register_id.open_cashbox_id()
+        action['view_id'] = self.env.ref('point_of_sale.view_account_bnk_stmt_cashbox_footer').id
+        action['context']['pos_session_id'] = self.id
+        action['context']['default_pos_id'] = self.config_id.id
+        return action
+
+    def set_cashbox_pos(self, cashbox_value, notes):
+        self.state = 'opened'
+        self.cash_register_id.balance_start = cashbox_value
+        if notes:
+            self.env['mail.message'].create({
+                        'body': notes,
+                        'model': 'account.bank.statement',
+                        'res_id': self.cash_register_id.id,
+                    })
+
+    def action_view_order(self):
+        return {
+            'name': _('Orders'),
+            'res_model': 'pos.order',
+            'view_mode': 'tree,form',
+            'views': [
+                (self.env.ref('point_of_sale.view_pos_order_tree_no_session_id').id, 'tree'),
+                (self.env.ref('point_of_sale.view_pos_pos_form').id, 'form'),
+                ],
+            'type': 'ir.actions.act_window',
+            'domain': [('session_id', 'in', self.ids)],
+        }
+
+    @api.model
+    def _alert_old_session(self):
+        # If the session is open for more then one week,
+        # log a next activity to close the session.
+        sessions = self.sudo().search([('start_at', '<=', (fields.datetime.now() - timedelta(days=7))), ('state', '!=', 'closed')])
+        for session in sessions:
+            if self.env['mail.activity'].search_count([('res_id', '=', session.id), ('res_model', '=', 'pos.session')]) == 0:
+                session.activity_schedule(
+                    'point_of_sale.mail_activity_old_session',
+                    user_id=session.user_id.id,
+                    note=_(
+                        "Your PoS Session is open since %(date)s, we advise you to close it and to create a new one.",
+                        date=session.start_at,
+                    )
+                )
+
+    def _warning_balance_closing(self):
+        self.ensure_one()
+
+        context = dict(self._context)
+        context['session_id'] = self.id
+
+        return {
+            'name': _('Balance control'),
+            'view_type': 'form',
+            'view_mode': 'form',
+            'res_model': 'closing.balance.confirm.wizard',
+            'views': [(False, 'form')],
+            'type': 'ir.actions.act_window',
+            'context': context,
+            'target': 'new'
+        }
+
+    def _check_if_no_draft_orders(self):
+        draft_orders = self.order_ids.filtered(lambda order: order.state == 'draft')
+        if draft_orders:
+            raise UserError(_(
+                    'There are still orders in draft state in the session. '
+                    'Pay or cancel the following orders to validate the session:\n%s'
+                ) % ', '.join(draft_orders.mapped('name'))
+            )
+        return True
+
+class ProcurementGroup(models.Model):
+    _inherit = 'procurement.group'
+
+    @api.model
+    def _run_scheduler_tasks(self, use_new_cursor=False, company_id=False):
+        super(ProcurementGroup, self)._run_scheduler_tasks(use_new_cursor=use_new_cursor, company_id=company_id)
+        self.env['pos.session']._alert_old_session()
+        if use_new_cursor:
+            self.env.cr.commit()
+
+class ClosingBalanceConfirm(models.TransientModel):
+    _name = 'closing.balance.confirm.wizard'
+    _description = 'This wizard is used to display a warning message if the manager wants to close a session with a too high difference between real and expected closing balance'
+
+    def confirm_closing_balance(self):
+        current_session =  self.env['pos.session'].browse(self._context['session_id'])
+        return current_session._validate_session()