From b037f93b77579b9516f809eb4731d16bcfce3034 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Krier?= <ced@b2ck.com>
Date: Sat, 7 Oct 2023 08:47:30 +0200
Subject: [PATCH] Prevent changing company of invoice with lines filled

Closes #12620
---
 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 f7d6ce588e..b70ac02923 100644
--- a/modules/account_invoice/invoice.py
+++ b/modules/account_invoice/invoice.py
@@ -69,7 +69,10 @@ class Invoice(Workflow, ModelSQL, ModelView, TaxableMixin, InvoiceReportMixin):
     company = fields.Many2One(
         'company.company', "Company", required=True,
         states={
-            'readonly': _states['readonly'] | Eval('party', True),
+            'readonly': (
+                _states['readonly']
+                | Eval('party', True)
+                | Eval('lines', [0])),
             })
     company_party = fields.Function(
         fields.Many2One(