diff --git a/__init__.py b/__init__.py
index f9b3583f95..c857677248 100644
--- a/__init__.py
+++ b/__init__.py
@@ -7,6 +7,7 @@ from .product import *
 from .stock import *
 from .configuration import *
 from .invoice import *
+from .party import PartyReplace
 
 
 def register():
@@ -40,4 +41,5 @@ def register():
         HandleShipmentException,
         HandleInvoiceException,
         OpenProductQuantitiesByWarehouse,
+        PartyReplace,
         module='purchase', type_='wizard')
diff --git a/party.py b/party.py
new file mode 100644
index 0000000000..1f2402b0e9
--- /dev/null
+++ b/party.py
@@ -0,0 +1,17 @@
+# 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() + [
+            ('purchase.product_supplier', 'party'),
+            ('purchase.purchase', 'party'),
+            ]