diff --git a/addons/mrp/mrp.py b/addons/mrp/mrp.py
index 96e2c0a91b1..4c6f7217082 100644
--- a/addons/mrp/mrp.py
+++ b/addons/mrp/mrp.py
@@ -1251,7 +1251,7 @@ class stock_warehouse_orderpoint(osv.osv):
         'logic': fields.selection([('max','Order to Max'),('price','Best price (not yet active!)')], 'Reordering Mode', required=True),
         'warehouse_id': fields.many2one('stock.warehouse', 'Warehouse', required=True),
         'location_id': fields.many2one('stock.location', 'Location', required=True),
-        'product_id': fields.many2one('product.product', 'Product', required=True, domain=[('type','=','product')]),
+        'product_id': fields.many2one('product.product', 'Product', ondelete='cascade', required=True, domain=[('type','=','product')]),
         'product_uom': fields.many2one('product.uom', 'Product UOM', required=True ),
         'product_min_qty': fields.float('Min Quantity', required=True,
             help="When the virtual stock goes belong the Min Quantity, Open ERP generates "\