Forbid payment of zero amount

Closes #13031

modules/account_payment/CHANGELOG

@@ -1,3 +1,4 @@
+* Enforce payment amount to be greater than zero
 
 Version 7.2.0 - 2024-04-29
 --------------------------

modules/account_payment/payment.py

@@ -295,6 +295,7 @@ class Payment(Workflow, ModelSQL, ModelView):
     date = fields.Date('Date', required=True, states=_STATES)
     amount = Monetary(
         "Amount", currency='currency', digits='currency', required=True,
+        domain=[('amount', '>', 0)],
         states={
             'readonly': ~Eval('state').in_(
                 If(Eval('process_method') == 'manual',

modules/account_payment/tests/scenario_account_payment_invoice.rst

@@ -114,12 +114,20 @@ Create multiple valid payments for one line::
     >>> pay_line = Wizard('account.move.line.pay', [line_to_pay])
     >>> pay_line.execute('next_')
     >>> pay_line.execute('next_')
+    >>> payment, = pay_line.actions[0]
+    >>> payment.amount
+    Decimal('100.00')
+    >>> payment.amount = Decimal('30.00')
+    >>> payment.save()
     >>> pay_line = Wizard('account.move.line.pay', [line_to_pay])
     >>> pay_line.execute('next_')
     >>> pay_line.execute('next_')
+    >>> payment, = pay_line.actions[0]
+    >>> payment.amount
+    Decimal('70.00')
+    >>> payment.amount = Decimal('30.00')
+    >>> payment.save()
     >>> payments = Payment.find([('state', '=', 'draft')])
-    >>> for payment in payments:
-    ...     payment.amount = Decimal('30')
     >>> Payment.click(payments, 'submit')
 
 Check amount to pay::