The basket is not updated by the CSaleBasket::Update method on 1c bitrix?

Question

PHP

Good afternoon!
The site was made on 1c bitrix and faced such a problem that when there is a product in the basket and its quantity is 1, I want to update the quantity of this product using the CSaleBasket::Update method, but nothing happens.
That is, I use:

$ids =83117; //id товара, которого надо изменить количество в корзине
  $quns = 1; //количество, на которое надо изменить

         $arFields = array(
       "QUANTITY" => $quns
    );

    CSaleBasket::Update($ids, $arFields);

But nothing happens, the product is not updated, I even checked the php debugger in the Bitrix admin panel, it also does not work.
Maybe someone knows what it could be?

Answer 1

$ids =83117; //id товара, которого надо изменить количество в корзине

- To update the number of goods, you need to pass not the id of the product , but the id of the cart record .
see example from documentation:

<?
// Изменим количество товара в записи $ID корзины на 2 штуки и отложим товар
$arFields = array(
   "QUANTITY" => 2,
   "DELAY" => "Y"
);
CSaleBasket::Update($ID, $arFields);
?>

Answer 2

I also do not update the quantity in the basket using the CSaleBasket:Update($arFields) method, but the updated one falls into the order. the NAME field is updated without problems, by the way, which is marked as mandatory in the doc.
look away script.js
postData['QUANTITY_' + items.rows[i].id] = BX('QUANTITY_' + items.rows[i].id).value;