[IMP] account: use PAY/XXX prefix for grouped payment memos

When creating a payment group, the generated memo previously used the 'BATCH/XXX' sequence prefix.

This naming was confusing because 'Batch Payment' is an existing and separate feature in Odoo.
To avoid this ambiguity and align the naming convention, this commit changes the memo prefix for all grouped payments to use the generic 'PAY/XXX'.

task-5231310

Author: jugurtha-gaci

addons/account/models/company.py

@@ -164,7 +164,7 @@ class ResCompany(models.Model):
             'padding': 5,
             'use_date_range': True,
             'company_id': self.id,
-            'prefix': 'BATCH/%(year)s/',
+            'prefix': 'PAY/%(year)s/',
         }),
     )
 

addons/account/tests/test_account_payment_register.py

@@ -204,7 +204,7 @@ def test_register_payment_single_batch_grouped_keep_open_lower_amount(self):
         })._create_payments()
 
         self.assertRecordValues(payments, [{
-            'memo': Like(f'BATCH/{self.current_year}/...'),
+            'memo': Like(f'PAY/{self.current_year}/...'),
             'payment_method_line_id': self.inbound_payment_method_line.id,
         }])
         self.assertRecordValues(payments.move_id.line_ids.sorted('balance'), [
@@ -237,7 +237,7 @@ def test_register_payment_single_batch_grouped_keep_open_higher_amount(self):
         })._create_payments()
 
         self.assertRecordValues(payments, [{
-            'memo': Like(f'BATCH/{self.current_year}/...'),
+            'memo': Like(f'PAY/{self.current_year}/...'),
             'payment_method_line_id': self.inbound_payment_method_line.id,
         }])
         self.assertRecordValues(payments.move_id.line_ids.sorted('balance'), [
@@ -272,7 +272,7 @@ def test_register_payment_single_batch_grouped_writeoff_lower_amount_debit(self)
         })._create_payments()
 
         self.assertRecordValues(payments, [{
-            'memo': Like(f'BATCH/{self.current_year}/...'),
+            'memo': Like(f'PAY/{self.current_year}/...'),
             'payment_method_line_id': self.inbound_payment_method_line.id,
         }])
         self.assertRecordValues(payments.move_id.line_ids.sorted('balance'), [
@@ -315,7 +315,7 @@ def test_register_payment_single_batch_grouped_writeoff_higher_amount_debit(self
         })._create_payments()
 
         self.assertRecordValues(payments, [{
-            'memo': Like(f'BATCH/{self.current_year}/...'),
+            'memo': Like(f'PAY/{self.current_year}/...'),
             'payment_method_line_id': self.inbound_payment_method_line.id,
         }])
         self.assertRecordValues(payments.move_id.line_ids.sorted('balance'), [