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diff --git a/addons/purchase_requisition/models/purchase.py b/addons/purchase_requisition/models/purchase.py
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+++ b/addons/purchase_requisition/models/purchase.py
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+# -*- encoding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import api, fields, models
+
+
+class PurchaseOrder(models.Model):
+    _inherit = 'purchase.order'
+
+    requisition_id = fields.Many2one('purchase.requisition', string='Purchase Agreement', copy=False)
+    is_quantity_copy = fields.Selection(related='requisition_id.is_quantity_copy', readonly=False)
+
+    @api.onchange('requisition_id')
+    def _onchange_requisition_id(self):
+        if not self.requisition_id:
+            return
+
+        self = self.with_company(self.company_id)
+        requisition = self.requisition_id
+        if self.partner_id:
+            partner = self.partner_id
+        else:
+            partner = requisition.vendor_id
+        payment_term = partner.property_supplier_payment_term_id
+
+        FiscalPosition = self.env['account.fiscal.position']
+        fpos = FiscalPosition.with_company(self.company_id).get_fiscal_position(partner.id)
+
+        self.partner_id = partner.id
+        self.fiscal_position_id = fpos.id
+        self.payment_term_id = payment_term.id,
+        self.company_id = requisition.company_id.id
+        self.currency_id = requisition.currency_id.id
+        if not self.origin or requisition.name not in self.origin.split(', '):
+            if self.origin:
+                if requisition.name:
+                    self.origin = self.origin + ', ' + requisition.name
+            else:
+                self.origin = requisition.name
+        self.notes = requisition.description
+        self.date_order = fields.Datetime.now()
+
+        if requisition.type_id.line_copy != 'copy':
+            return
+
+        # Create PO lines if necessary
+        order_lines = []
+        for line in requisition.line_ids:
+            # Compute name
+            product_lang = line.product_id.with_context(
+                lang=partner.lang or self.env.user.lang,
+                partner_id=partner.id
+            )
+            name = product_lang.display_name
+            if product_lang.description_purchase:
+                name += '\n' + product_lang.description_purchase
+
+            # Compute taxes
+            taxes_ids = fpos.map_tax(line.product_id.supplier_taxes_id.filtered(lambda tax: tax.company_id == requisition.company_id)).ids
+
+            # Compute quantity and price_unit
+            if line.product_uom_id != line.product_id.uom_po_id:
+                product_qty = line.product_uom_id._compute_quantity(line.product_qty, line.product_id.uom_po_id)
+                price_unit = line.product_uom_id._compute_price(line.price_unit, line.product_id.uom_po_id)
+            else:
+                product_qty = line.product_qty
+                price_unit = line.price_unit
+
+            if requisition.type_id.quantity_copy != 'copy':
+                product_qty = 0
+
+            # Create PO line
+            order_line_values = line._prepare_purchase_order_line(
+                name=name, product_qty=product_qty, price_unit=price_unit,
+                taxes_ids=taxes_ids)
+            order_lines.append((0, 0, order_line_values))
+        self.order_line = order_lines
+
+    def button_confirm(self):
+        res = super(PurchaseOrder, self).button_confirm()
+        for po in self:
+            if not po.requisition_id:
+                continue
+            if po.requisition_id.type_id.exclusive == 'exclusive':
+                others_po = po.requisition_id.mapped('purchase_ids').filtered(lambda r: r.id != po.id)
+                others_po.button_cancel()
+                if po.state not in ['draft', 'sent', 'to approve']:
+                    po.requisition_id.action_done()
+        return res
+
+    @api.model
+    def create(self, vals):
+        purchase = super(PurchaseOrder, self).create(vals)
+        if purchase.requisition_id:
+            purchase.message_post_with_view('mail.message_origin_link',
+                    values={'self': purchase, 'origin': purchase.requisition_id},
+                    subtype_id=self.env['ir.model.data'].xmlid_to_res_id('mail.mt_note'))
+        return purchase
+
+    def write(self, vals):
+        result = super(PurchaseOrder, self).write(vals)
+        if vals.get('requisition_id'):
+            self.message_post_with_view('mail.message_origin_link',
+                    values={'self': self, 'origin': self.requisition_id, 'edit': True},
+                    subtype_id=self.env['ir.model.data'].xmlid_to_res_id('mail.mt_note'))
+        return result
+
+
+class PurchaseOrderLine(models.Model):
+    _inherit = 'purchase.order.line'
+
+    @api.onchange('product_qty', 'product_uom')
+    def _onchange_quantity(self):
+        res = super(PurchaseOrderLine, self)._onchange_quantity()
+        if self.order_id.requisition_id:
+            for line in self.order_id.requisition_id.line_ids.filtered(lambda l: l.product_id == self.product_id):
+                if line.product_uom_id != self.product_uom:
+                    self.price_unit = line.product_uom_id._compute_price(
+                        line.price_unit, self.product_uom)
+                else:
+                    self.price_unit = line.price_unit
+                break
+        return res