diff --git a/purchase.py b/purchase.py
index 3e50737edc..0326d63bd8 100644
--- a/purchase.py
+++ b/purchase.py
@@ -856,6 +856,7 @@ class Move(OSV):
 
         res = {}
         for move in self.browse(cursor, user, ids, context=context):
+            res[move.id] = False
             if move.purchase_line:
                 res[move.id] = move.purchase_line.purchase.id