diff --git a/addons/mrp/stock.py b/addons/mrp/stock.py
index 0c1454edf98..29994398f06 100644
--- a/addons/mrp/stock.py
+++ b/addons/mrp/stock.py
@@ -137,14 +137,13 @@ class StockMove(osv.osv):
         wf_service = netsvc.LocalService("workflow")
         for move in self.browse(cr, uid, ids, context=context):
             new_moves = super(StockMove, self).action_scrap(cr, uid, [move.id], product_qty, location_id, context=context)
-            self.write(cr, uid, [move.id], {'prodlot_id': False, 'tracking_id': False})
             production_ids = production_obj.search(cr, uid, [('move_lines', 'in', [move.id])])
             for prod_id in production_ids:
                 wf_service.trg_validate(uid, 'mrp.production', prod_id, 'button_produce', cr)
             for new_move in new_moves:
                 production_obj.write(cr, uid, production_ids, {'move_lines': [(4, new_move)]})
                 res.append(new_move)
-        return {}
+        return res
 
 StockMove()