public function setSoldIndividually(string $sold_individually = "T") : CNabuDataObject
    {
        if ($sold_individually === null) {
            throw new ENabuCoreException(
                    ENabuCoreException::ERROR_NULL_VALUE_NOT_ALLOWED_IN,
                    array("\$sold_individually")
            );
        }
        $this->setValue('nb_commerce_product_sold_individually', $sold_individually);
        
        return $this;
    }