if len(account_move_ids):
            draft_moves = pool.get('account.move').browse(cr, uid, account_move_ids, context)
            str_draft_moves = '\n'.join(['id: %s, date: %s, number: %s, ref: %s' % (move.id, move.date, move.name, move.ref) for move in draft_moves])
            raise osv.except_osv(_('Error'), _('One or more draft moves found: \n%s') % str_draft_moves)