How to prohibit changing sections of the 1C-Bitrix store when exchanging with 1c?

Question

1C-Bitrix

Hello!
Registered in init.php

AddEventHandler("iblock", "OnAfterIBlockElementAdd", "DropNAME");
AddEventHandler("iblock", "OnBeforeIBlockElementUpdate", "DropNAME");
AddEventHandler("iblock", "OnBeforeIBlockElementUpdate","SaveInOldSection");

function DropNAME($arFields)
{    
    if ($_REQUEST['mode']=='import') {
        unset($arFields['NAME']);
        unset($arFields['ACTIVE']);
    }
}

function SaveInOldSection(&$arFields)
{
    if ($_REQUEST['mode']=='import') {
        $db_old_groups = CIBlockElement::GetElementGroups($arFields['ID'], true);
        while($ar_group = $db_old_groups->Fetch()) {
      if(!in_array($ar_group['ID'],$arFields['IBLOCK_SECTION'])) {
                $arFields['IBLOCK_SECTION'][]=$ar_group['ID'];
      }
        }
    }
}

But all the same, when exchanging with 1s, the location of the section changes, that is, it goes to the 2nd level, for example, and so on.
Bitrix version 20.0.950