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