diff --git a/__init__.py b/__init__.py
index 59e356c638..e07d156a81 100644
--- a/__init__.py
+++ b/__init__.py
@@ -5,6 +5,7 @@ from trytond.pool import Pool
 from stock import *
 from sale import *
 from purchase import *
+from .party import PartyReplace
 
 
 def register():
@@ -24,4 +25,5 @@ def register():
     Pool.register(
         CreatePurchase,
         PurchaseHandleShipmentException,
+        PartyReplace,
         module='sale_supply_drop_shipment', type_='wizard')
diff --git a/party.py b/party.py
new file mode 100644
index 0000000000..80fb9c3adc
--- /dev/null
+++ b/party.py
@@ -0,0 +1,19 @@
+# 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.request', 'customer'),
+            ('purchase.purchase', 'customer'),
+            ('stock.shipment.drop', 'supplier'),
+            ('stock.shipment.drop', 'customer'),
+            ]