diff --git a/__init__.py b/__init__.py
index 6d60a3714e..6d7ca98dc1 100644
--- a/__init__.py
+++ b/__init__.py
@@ -6,6 +6,7 @@ from .commission import *
 from .invoice import *
 from .sale import *
 from .product import *
+from . import party
 
 
 def register():
@@ -25,4 +26,5 @@ def register():
         module='commission', type_='model')
     Pool.register(
         CreateInvoice,
+        party.PartyReplace,
         module='commission', type_='wizard')
diff --git a/party.py b/party.py
new file mode 100644
index 0000000000..722bc75ef9
--- /dev/null
+++ b/party.py
@@ -0,0 +1,16 @@
+# This file is part of Tryton.  The COPYRIGHT file at the top level of
+# this repository contains the full copyright notices and license terms.
+from trytond.pool import PoolMeta
+
+__all__ = ['PartyReplace']
+
+
+class PartyReplace:
+    __metaclass__ = PoolMeta
+    __name__ = 'party.replace'
+
+    @classmethod
+    def fields_to_replace(cls):
+        return super(PartyReplace, cls).fields_to_replace() + [
+            ('commission.agent', 'party'),
+            ]