diff --git a/addons/account/account_move_line.py b/addons/account/account_move_line.py
index ba486b67551..7d41ea6f4d1 100644
--- a/addons/account/account_move_line.py
+++ b/addons/account/account_move_line.py
@@ -426,7 +426,7 @@ class account_move_line(osv.osv):
         'account_id': fields.many2one('account.account', 'Account', required=True, ondelete="cascade", domain=[('type','<>','view'), ('type', '<>', 'closed')], select=2),
         'move_id': fields.many2one('account.move', 'Move', ondelete="cascade", help="The move of this entry line.", select=2, required=True),
         'narration': fields.related('move_id','narration', type='text', relation='account.move', string='Narration'),
-        'ref': fields.related('move_id', 'ref', type='char', size=64),
+        'ref': fields.related('move_id', 'ref', type='char', size=64, store=True),
         'statement_id': fields.many2one('account.bank.statement', 'Statement', help="The bank statement used for bank reconciliation", select=1),
         'reconcile_id': fields.many2one('account.move.reconcile', 'Reconcile', readonly=True, ondelete='set null', select=2),
         'reconcile_partial_id': fields.many2one('account.move.reconcile', 'Partial Reconcile', readonly=True, ondelete='set null', select=2),