static public function findBySKU($nb_commerce, string $sku)
    {
        $retval = false;
        $nb_commerce_id = nb_getMixedValue($nb_commerce, NABU_COMMERCE_FIELD_ID);
        if (is_numeric($nb_commerce_id)) {
            $retval = CNabuCommerceProduct::buildObjectFromSQL(
                'SELECT *
                   from nb_commerce_product
                  where nb_commerce_id=%commerce_id$d
                    and nb_commerce_product_sku=\'%sku$s\'
                ',
                array(
                    'commerce_id' => $nb_commerce_id,
                    'sku' => $sku
                )
            );
        }

        return $retval;
    }