Реализация справочников в CRM

#Создаем 2 инфоблока, связываем их, по ID
#Создаем 2 пользовательских свойства, тип привязка к эл. инфоблока
#js код
Array.prototype.in_array = function(needle) {
   for(var i = 0, l = this.length; i < l; i++)  {
      if(this[i] == needle) {
         return true;
      }
   }
   return false;
}

$(document).ready(function(){

    $("select[name=UF_CLASSIFICATION] option").hide();

    $("select[name=UF_CLASSIFICATION]").attr("disabled","disabled");


    /*Classification*/
    $("select[name=UF_CATEGORY]").change(function(){
        var categoryId = $(this).val();

        var dataAjax = {};

        dataAjax["categoryId"] = categoryId;

        $.ajax({
            type:'POST',
            url:'/local/ajax/support_classification.php',
            success:function(data){

                $("select[name=UF_CLASSIFICATION]").removeAttr("disabled");

                $("select[name=UF_CLASSIFICATION] option").each(function(){
                    var val = parseInt($(this).attr("value"));

                    if(!data.in_array(val)){
                        $(this).hide();
                    }else{
                        $(this).show();
                    }

                });

            },
            data:dataAjax,
            dataType:'json'
        });
    });
});

#PHP код
<?
require($_SERVER["DOCUMENT_ROOT"]."/bitrix/modules/main/include/prolog_before.php");

CModule::IncludeModule("iblock");

$cID = $arr["VALUE"];

$objClassification = CIBlockElement::GetList(
    array("ID"=>"ASC"),
    Array("IBLOCK_ID" => 38, "PROPERTY_ID" => intval($_REQUEST["categoryId"])),
    false,
    false,
    Array("ID", "NAME", "IBLOCK_ID",)
);

while($arrClassification = $objClassification->Fetch()){
    $arClassification[] = $arrClassification["ID"];
}

echo json_encode($arClassification);
?>