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$mxResult = CCatalogSku::GetProductInfo( $arItem['PRODUCT_ID'] );
    if ( $mxResult["ID"] ) {
        $arFilterProduct = array(
            "ID" => $mxResult["ID"] ,
            "IBLOCK_ID"=>2,
        );

        $rsProduct = CIBlockElement::GetList(array(), $arFilterProduct, false, array(), array("ID", "DETAIL_PAGE_URL"));
        while($arProduct = $rsProduct->GetNext()) {
            $arItem['DETAIL_PAGE_URL'] = $arProduct['DETAIL_PAGE_URL'];
        }
    }