protected function _checkLock($value)
	{
		switch($value)
		{
			case MShop_Order_Manager_Base_Abstract::LOCK_DISABLE:
			case MShop_Order_Manager_Base_Abstract::LOCK_ENABLE:
				break;
			default:
				throw new MShop_Order_Exception( sprintf( 'Lock flag "%1$d" not within allowed range', $value ) );
		}
	}