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(