From 3b292c46b71ec73dd5b8ffd2ad03009a441cd2d6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Krier?= <ced@b2ck.com>
Date: Wed, 11 Mar 2026 19:04:22 +0100
Subject: [PATCH] Forbid the payment of an amount of 0 when the amount is
 editable

Closes #14670
---
 modules/account_payment/payment.py | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/modules/account_payment/payment.py b/modules/account_payment/payment.py
index 2577397639..250a0f9b9b 100644
--- a/modules/account_payment/payment.py
+++ b/modules/account_payment/payment.py
@@ -303,7 +303,14 @@ class Payment(Workflow, ModelSQL, ModelView, ChatMixin):
     date = fields.Date('Date', required=True, states=_STATES)
     amount = Monetary(
         "Amount", currency='currency', digits='currency', required=True,
-        domain=[('amount', '>=', 0)],
+        domain=[
+            If(Eval('state').in_(
+                    If(Eval('process_method') == 'manual',
+                        ['draft', 'processing'],
+                        ['draft'])),
+                ('amount', '>', 0),
+                ('amount', '>=', 0)),
+            ],
         states={
             'readonly': ~Eval('state').in_(
                 If(Eval('process_method') == 'manual',