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