[17.0][FIX] account_payment_order: Assure partner bank account in payments

account_payment_order/models/account_payment.py

@@ -45,6 +45,15 @@
         for item in self:
             item.payment_line_date = item.payment_line_ids[:1].date
 
+    @api.depends("payment_line_ids")
+    def _compute_partner_bank_id(self):
+        # Force the payment line bank account. The grouping function has already
+        # assured that there's no more than one bank account in the group
+        order_pays = self.filtered("payment_line_ids")
+        for pay in order_pays:
+            pay.partner_bank_id = pay.payment_line_ids.partner_bank_id
+        return super(AccountPayment, self - order_pays)._compute_partner_bank_id()
+
     def update_payment_reference(self):
         view = self.env.ref("account_payment_order.account_payment_update_view_form")
         return {

account_payment_order/tests/test_payment_order_outbound.py

@@ -203,6 +203,7 @@ def order_creation(self, date_prefered):
         line_created_due.create_payment_lines()
         self.assertGreater(len(order.payment_line_ids), 0)
         order.draft2open()
+        self.assertEqual(order.payment_ids[0].partner_bank_id, self.partner.bank_ids)
         order.open2generated()
         order.generated2uploaded()
         self.assertEqual(order.move_ids[0].date, order.payment_ids[0].date)