From d536fe3035c0c9ef4cd2e530814b69d4b56fe10e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Krier?= <ced@b2ck.com>
Date: Fri, 5 Apr 2013 00:17:18 +0200
Subject: [PATCH] Fix missing unique shipment migration

issue3110
review754002
---
 purchase.py | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/purchase.py b/purchase.py
index fc50375f63..a2b63c7d31 100644
--- a/purchase.py
+++ b/purchase.py
@@ -2,7 +2,7 @@
 #this repository contains the full copyright notices and license terms.
 from trytond.model import fields
 from trytond.pyson import Eval
-from trytond.pool import PoolMeta
+from trytond.pool import Pool, PoolMeta
 
 
 __all__ = ['PurchaseRequest', 'Purchase', 'PurchaseLine', 'ProductSupplier',
@@ -62,8 +62,9 @@ class Purchase:
         return result
 
     def get_drop_shipments(self, name):
-        return list(set(m.shipment_drop.id for l in self.lines for m in l.moves
-                if m.shipment_drop))
+        DropShipment = Pool().get('stock.shipment.drop')
+        return list(set(m.shipment.id for l in self.lines for m in l.moves
+                if isinstance(m.shipment, DropShipment)))
 
 
 class PurchaseLine: