[FIX] account_accountant_ux: fix in order to allow to transform check…

account_accountant_ux/models/__init__.py

@@ -8,3 +8,4 @@
 from . import account_move_line
 from . import account_move
 from . import account_journal_dashboard
+from . import account_payment

account_accountant_ux/models/account_payment.py

@@ -0,0 +1,14 @@
+from odoo import models, api
+from odoo.exceptions import  ValidationError
+
+class AccountPayment(models.Model):
+    _inherit = 'account.payment'
+
+    @api.constrains('payment_method_line_id')
+    def _check_payment_method_line_id(self):
+        ''' Ensure the 'payment_method_line_id' field is not null.
+        Can't be done using the regular 'required=True' because the field is a computed editable stored one.
+        '''
+        for pay in self:
+            if not pay.payment_method_line_id:
+                raise ValidationError(_("Please define a payment method line on your payment."))