diff --git a/purchase_request.py b/purchase_request.py
index d4fb301bac..9c714f0ffa 100644
--- a/purchase_request.py
+++ b/purchase_request.py
@@ -53,6 +53,15 @@ class PurchaseRequest(ModelSQL, ModelView):
             'create_request': 'Purchase requests are only created by the system.',
             })
 
+    def init(self, module_name):
+        cursor = Transaction().cursor
+        super(PurchaseRequest, self).init(module_name)
+
+        # Migration from 2.0: empty order point origin is -1 instead of 0
+        cursor.execute('UPDATE "%s" '
+            'SET origin = %%s WHERE origin = %%s' % self._table,
+            ('stock.order_point,-1', 'stock.order_point,0'))
+
     def get_rec_name(self, ids, name):
         if isinstance(ids, (int, long)):
             ids = [ids]
@@ -333,7 +342,7 @@ class PurchaseRequest(ModelSQL, ModelView):
         if order_point:
             origin = 'stock.order_point,%s'%order_point.id
         else:
-            origin = 'stock.order_point,0'
+            origin = 'stock.order_point,-1'
         return {'product': product,
                 'party': supplier and supplier or None,
                 'quantity': quantity,
diff --git a/purchase_request.xml b/purchase_request.xml
index 16ff11c71a..b904bcb233 100644
--- a/purchase_request.xml
+++ b/purchase_request.xml
@@ -178,7 +178,7 @@ this repository contains the full copyright notices and license terms. -->
 
         <record model="ir.action.keyword" id="create_purchase_keyword">
             <field name="keyword">form_action</field>
-            <field name="model">purchase.request,0</field>
+            <field name="model">purchase.request,-1</field>
             <field name="action" ref="wizard_create_purchase"/>
         </record>
 
@@ -200,7 +200,7 @@ this repository contains the full copyright notices and license terms. -->
         <record model="ir.action.keyword"
                 id="act_open_purchase_keyword1">
             <field name="keyword">form_relate</field>
-            <field name="model">purchase.request,0</field>
+            <field name="model">purchase.request,-1</field>
             <field name="action" ref="act_purchase_form"/>
         </record>