[IMP] account_payment_order_grouped_output: Maturity date in grouped moves

For propagating maturity dates from the individual payment moves to the
grouped ones, 2 actions are taken:

- For the counterpart that will neutralize each payment, we put the
  maturity date according to the same logic as the payment one.
- For the grouped AR/AP, we put the first payment date  of all the
  grouped payments, as all of them should be the same after grouping
  by this criterium in _prepare_trf_moves.

TT50671

account_payment_order_grouped_output/models/account_payment_order.py

@@ -149,6 +149,8 @@ class AccountPaymentOrder(models.Model):
             ),
             "currency_id": payment.currency_id.id,
             "amount_currency": payment.amount * sign,
+            # Same logic as the individual payments
+            "date_maturity": payment.payment_line_ids[0].date,
         }
         return vals
 
@@ -181,6 +183,8 @@ class AccountPaymentOrder(models.Model):
             ),
             "currency_id": payments[0].currency_id.id,
             "amount_currency": amount_payment_currency * sign,
+            # All the lines should have the same date following _prepare_trf_moves
+            "date_maturity": payments.payment_line_ids[:1].date,
         }
         return vals
 

account_payment_order_grouped_output/tests/test_payment_order_inbound_grouped.py

@@ -1,6 +1,9 @@
 # Copyright 2022 Tecnativa - Pedro M. Baeza
 # License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
 
+from freezegun import freeze_time
+
+from odoo import fields
 from odoo.tests.common import tagged
 
 from odoo.addons.account_payment_order.tests.test_payment_order_inbound import (
@@ -10,9 +13,12 @@ from odoo.addons.account_payment_order.tests.test_payment_order_inbound import (
 
 @tagged("post_install", "-at_install")
 class TestPaymentOrderInbound(TestPaymentOrderInboundBase):
+    @freeze_time("2024-04-01")
     def test_grouped_output(self):
         self.inbound_mode.generate_move = True
         self.inbound_mode.post_move = True
+        self.inbound_order.date_prefered = "fixed"
+        self.inbound_order.date_scheduled = "2024-08-01"
         self.inbound_order.draft2open()
         self.inbound_order.open2generated()
         self.inbound_order.generated2uploaded()
@@ -35,3 +41,9 @@ class TestPaymentOrderInbound(TestPaymentOrderInboundBase):
         grouped_moves = self.inbound_order.grouped_move_ids
         self.assertTrue(grouped_moves)
         self.assertTrue(grouped_moves.line_ids[0].reconciled)
+        self.assertTrue(
+            all(
+                x.date_maturity == fields.Date.from_string("2024-08-01")
+                for x in grouped_moves.line_ids
+            )
+        )