diff --git a/addons/stock_account/stock.py b/addons/stock_account/stock.py
index 295c17f5e1a..16483e76c26 100644
--- a/addons/stock_account/stock.py
+++ b/addons/stock_account/stock.py
@@ -191,7 +191,7 @@ class stock_picking(osv.osv):
         pick = self.browse(cr, uid, picking_id, context=context)
         moves = [x.id for x in pick.move_lines]
         move_obj= self.pool.get("stock.move")
-        move_obj.write(cr, uid, moves, {'invoice_state': pick.invoice_state}, context=context)
+        move_obj.write(cr, uid, moves, {'invoice_state': value}, context=context)
 
     _columns = {
         'invoice_state': fields.function(__get_invoice_state, type='selection', selection=[