VS GW (Все сообщения пользователя)

$by = "id";
$order = "asc";
$dbUsers = CUser::GetList(
    $by,
    $order,
    array('ID' => $usersIdList)
);
while($dbUser = $dbUsers->Fetch()) {
    $users[] = $dbUser;
}

global $USER_FIELD_MANAGER;

$res = $USER_FIELD_MANAGER->Update('IBLOCK_5_SECTION', $sectionId, array(
    'UF_ALLOWED_FILTERS' => array(148, 149)
));
$section = CIBlockSection::GetByID($sectionId)->GetNext();

var_dump($res);
var_dump($section['UF_ALLOWED_FILTERS']);

bool(true)
NULL