diff --git a/addons/stock_landed_costs/stock_landed_costs.py b/addons/stock_landed_costs/stock_landed_costs.py
index 2efcfc160c7..497f5bd7963 100644
--- a/addons/stock_landed_costs/stock_landed_costs.py
+++ b/addons/stock_landed_costs/stock_landed_costs.py
@@ -296,4 +296,12 @@ class stock_valuation_adjustment_lines(osv.osv):
         'flag': 'original',
     }
 
+    def copy(self, cr, uid, id, default=None, context=None):
+        if default is None:
+            default = {}
+        default.update({
+            'account_move_id':False,
+        })
+        return super(stock_valuation_adjustment_lines, self).copy(cr, uid, id, default, context=context)
+
 # vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4: