diff --git a/modules/account_statement/statement.py b/modules/account_statement/statement.py
index c54926d4f4..882002bdad 100644
--- a/modules/account_statement/statement.py
+++ b/modules/account_statement/statement.py
@@ -797,10 +797,10 @@ class Line(origin_mixin(_states), sequence_ordered(), ModelSQL, ModelView):
                 | Bool(Eval('origin', 0))),
             }
         cls.account.required = True
-        cls.party.states = {
-            'required': (Eval('party_required', False)
-                & (Eval('statement_state') == 'draft')),
-            }
+        cls.party.states['required'] = (
+            cls.party.states.get('required', False)
+            | (Eval('party_required', False)
+                & (Eval('statement_state') == 'draft')))
         cls.amount_second_currency.domain = [
             If(Eval('second_currency', None),
                 If(Eval('amount', 0) >= 0,