Форум

require_once($_SERVER['DOCUMENT_ROOT'] . "/bitrix/modules/main/include/prolog_before.php");
use Bitrix\Main\Loader;
Loader::includeModule("highloadblock");

use Bitrix\Highloadblock as HL;

$id = 1;
$hlbl = 6;
$fid = 65;

$hlblock = HL\HighloadBlockTable::getById($hlbl)->fetch();
$entity = HL\HighloadBlockTable::compileEntity($hlblock);
$entityCode = $entity->getDataClass();

$data["UF_DOC"] = $fid;
$data["UF_TXT"] = $fid;

$result = $entityCode::update($id, $data);