Change of price and available quantity at unloading?

Question

1C-Bitrix

There are 2 infoblocks on the site: Main (with structure and products) and auxiliary (only products here)

.

When importing into the service infoblock, I need to take the price and the balance of the goods from it and find the same in the main article by the article and substitute these values ​​for it

AddEventHandler("iblock", "OnAfterIBlockElementUpdate", "OrelBase");

function OrelBase(&$arFields)
{
  $price = CPrice::GetBasePrice($arFields['ID']);
  $count = CCatalogProduct::GetByID($arFields['ID']);
 	$item_orel = array(
    'NAME' => $arFields['NAME'],
    'ID' => $arFields['ID'],
    'ARTICUL' => $arFields['PROPERTY_VALUES']['9728']['271613275']['VALUE'],
    'PRICE_VALUE' => $price['PRICE'],
    'COUNT' => $count['QUANTITY']
   );

 	
  AddMessage2Log("<br/><br/><pre>".print_r($item_orel,true)."</pre><br/><br/>", "test");
   $res_tula = CIBlockElement::GetList(array("SORT"=>"ASC"),array('IBLOCK_ID' => 21,'PROPERTY_CML2_ARTICLE' => $item_orel['ARTICUL']), false,false, array("NAME", "ID", "PROPERTY_CML2_ARTICLE"));
  while($ob = $res_tula->GetNextElement())
  {
    $arFields = $ob->GetFields();
    //print_r($arFields);
    $price = CPrice::GetBasePrice($arFields['ID']);
    $count = CCatalogProduct::GetByID($arFields['ID']);

    /*меням цену*/

    $PRODUCT_ID = $arFields['ID'];
    $PRICE_TYPE_ID = 1;

    $arFields_price = Array(
        "PRODUCT_ID" => $PRODUCT_ID,
        "CATALOG_GROUP_ID" => $PRICE_TYPE_ID,
        "PRICE" => $item_orel['PRICE_VALUE'],
        "CURRENCY" => "RUB"
    );

    $res = CPrice::GetList(
            array(),
            array(
                  "PRODUCT_ID" => $PRODUCT_ID,
                  "CATALOG_GROUP_ID" => $PRICE_TYPE_ID
              )
      );

    if ($arr = $res->Fetch())
    {
        CPrice::Update($arr["ID"], $arFields_price);
    }
    else
    {
        CPrice::Add($arFields_price);
    }
    /*меням цену конец*/

    /*меняем количество*/

    CCatalogProduct::Update($arFields['ID'], array('QUANTITY' => $item_orel['COUNT']));

    /*меняем количество конец*/
  }

}

When simply saving a resource in the admin panel, the replacement takes place every other time, and when importing, it does not happen at all

Answer 1

Put logging and trace.
Add after

function OrelBase(&$arFields)
{

file_put_contents($_SERVER["DOCUMENT_ROOT"]."/log.txt", json_encode($arFields));