public function setAllowNotification(string $allow_notification = "F") : CNabuDataObject
    {
        if ($allow_notification === null) {
            throw new ENabuCoreException(
                    ENabuCoreException::ERROR_NULL_VALUE_NOT_ALLOWED_IN,
                    array("\$allow_notification")
            );
        }
        $this->setValue('nb_user_allow_notification', $allow_notification);
        
        return $this;
    }