public function setMountingOrder(int $mounting_order = 0) : CNabuDataObject
    {
        if ($mounting_order === null) {
            throw new ENabuCoreException(
                    ENabuCoreException::ERROR_NULL_VALUE_NOT_ALLOWED_IN,
                    array("\$mounting_order")
            );
        }
        $this->setValue('nb_site_mounting_order', $mounting_order);
        
        return $this;
    }