diff --git a/account_accountant_ux/models/__init__.py b/account_accountant_ux/models/__init__.py
index c17867bb..f31e95ab 100644
--- a/account_accountant_ux/models/__init__.py
+++ b/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
diff --git a/account_accountant_ux/models/account_payment.py b/account_accountant_ux/models/account_payment.py
new file mode 100644
index 00000000..d52f42b6
--- /dev/null
+++ b/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."))