From aec3bd0237c81c0de36b97cf69215e723da650c7 Mon Sep 17 00:00:00 2001
From: Sergi Almacellas Abellana <sergi@kopen.es>
Date: Sun, 18 Jan 2026 00:18:32 +0100
Subject: [PATCH] Set the invoice date to read-only once the invoice has been
 validated or posted

Closes #14480
(grafted from 131cabff89d9e3f130cc29dd800fedc0997d4ac9)

--HG--
branch : 6.0
---
 modules/account_invoice/invoice.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/modules/account_invoice/invoice.py b/modules/account_invoice/invoice.py
index 6c6f7f9ad8..0dbef6b0ad 100644
--- a/modules/account_invoice/invoice.py
+++ b/modules/account_invoice/invoice.py
@@ -93,7 +93,10 @@ class Invoice(Workflow, ModelSQL, ModelView, TaxableMixin):
             ], "State", readonly=True)
     invoice_date = fields.Date('Invoice Date',
         states={
-            'readonly': Eval('state').in_(['posted', 'paid', 'cancelled']),
+            'readonly': Eval('state').in_(
+                If(Eval('type') == 'in',
+                    ['validated', 'posted', 'paid'],
+                    ['posted', 'paid'])),
             'required': Eval('state').in_(
                 If(Eval('type') == 'in',
                     ['validated', 'posted', 'paid'],