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diff --git a/addons/l10n_se_ocr/models/account_move.py b/addons/l10n_se_ocr/models/account_move.py
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+++ b/addons/l10n_se_ocr/models/account_move.py
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+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import api, fields, models, _
+from odoo.exceptions import UserError
+from stdnum import luhn
+
+
+class AccountMove(models.Model):
+    _inherit = 'account.move'
+
+    def _get_invoice_reference_se_ocr2(self, reference):
+        self.ensure_one()
+        return reference + luhn.calc_check_digit(reference)
+
+    def _get_invoice_reference_se_ocr3(self, reference):
+        self.ensure_one()
+        reference = reference + str(len(reference) + 2)[:1]
+        return reference + luhn.calc_check_digit(reference)
+
+    def _get_invoice_reference_se_ocr4(self, reference):
+        self.ensure_one()
+
+        ocr_length = self.journal_id.l10n_se_invoice_ocr_length
+
+        if len(reference) + 1 > ocr_length:
+            raise UserError(_("OCR Reference Number length is greater than allowed. Allowed length in invoice journal setting is %s.") % str(ocr_length))
+
+        reference = reference.rjust(ocr_length - 1, '0')
+        return reference + luhn.calc_check_digit(reference)
+
+
+    def _get_invoice_reference_se_ocr2_invoice(self):
+        self.ensure_one()
+        return self._get_invoice_reference_se_ocr2(str(self.id))
+
+    def _get_invoice_reference_se_ocr3_invoice(self):
+        self.ensure_one()
+        return self._get_invoice_reference_se_ocr3(str(self.id))
+
+    def _get_invoice_reference_se_ocr4_invoice(self):
+        self.ensure_one()
+        return self._get_invoice_reference_se_ocr4(str(self.id))
+
+    def _get_invoice_reference_se_ocr2_partner(self):
+        self.ensure_one()
+        return self._get_invoice_reference_se_ocr2(self.partner_id.ref if str(self.partner_id.ref).isdecimal() else str(self.partner_id.id))
+
+    def _get_invoice_reference_se_ocr3_partner(self):
+        self.ensure_one()
+        return self._get_invoice_reference_se_ocr3(self.partner_id.ref if str(self.partner_id.ref).isdecimal() else str(self.partner_id.id))
+
+    def _get_invoice_reference_se_ocr4_partner(self):
+        self.ensure_one()
+        return self._get_invoice_reference_se_ocr4(self.partner_id.ref if str(self.partner_id.ref).isdecimal() else str(self.partner_id.id))
+
+    @api.onchange('partner_id')
+    def _onchange_partner_id(self):
+        """ If Vendor Bill and Vendor OCR is set, add it. """
+        if self.partner_id and self.move_type == 'in_invoice' and self.partner_id.l10n_se_default_vendor_payment_ref:
+            self.payment_reference = self.partner_id.l10n_se_default_vendor_payment_ref
+        return super(AccountMove, self)._onchange_partner_id()
+
+    @api.onchange('payment_reference')
+    def _onchange_payment_reference(self):
+        """ If Vendor Bill and Payment Reference is changed check validation. """
+        if self.partner_id and self.move_type == 'in_invoice' and self.partner_id.l10n_se_check_vendor_ocr:
+            reference = self.payment_reference
+            try:
+                luhn.validate(reference)
+            except: 
+                return {'warning': {'title': _('Warning'), 'message': _('Vendor require OCR Number as payment reference. Payment reference isn\'t a valid OCR Number.')}}
+        return super(AccountMove, self)._onchange_payment_reference()