diff --git a/modules/purchase_trade/duplicate.py b/modules/purchase_trade/duplicate.py
index 894b7df..70dea94 100644
--- a/modules/purchase_trade/duplicate.py
+++ b/modules/purchase_trade/duplicate.py
@@ -60,7 +60,9 @@ class TradeCustomDuplicateStart(ModelView):
     mirror_party = fields.Many2One('party.party', "Mirror Counterparty",
         states={
             'invisible': ~Bool(Eval('create_matched_mirror')),
-            'required': Bool(Eval('create_matched_mirror')),
+            'required': (
+                Bool(Eval('create_matched_mirror'))
+                & (Eval('mirror_mode') == 'new_mirror')),
         })