public function setStatus(string $status = "E") : CNabuDataObject
    {
        if ($status === null) {
            throw new ENabuCoreException(
                    ENabuCoreException::ERROR_NULL_VALUE_NOT_ALLOWED_IN,
                    array("\$status")
            );
        }
        $this->setValue('nb_user_group_status', $status);
        
        return $this;
    }