How to add the required number of products to the Bitrix cart?

Question

1C-Bitrix

Good afternoon! Please tell me how to solve this problem.
In 1s Bitrix, when a product has a trade offer, then when it is added to the cart, it is added one at a time.
With a simple product, this problem does not arise. I can't figure out why this is happening.

Answer 1

There may be only 1 item available.

Answer 2

Excuse me, but how do you think it should happen?
SKU is not a kit and not a set, why would it be added more than one?
Let's deal with the entities
Trade offer
Sets
Sets
https://dev.1c-bitrix.ru/learning/course/index.php...

Answer 3

Maybe it's clumsy, but it all worked.
Through ajax, I passed the product data: id and quantity to the addbasket file, which I created in the template for the site. You can shove it elsewhere.
addbasket.php code
<? require_once ($_SERVER['DOCUMENT_ROOT']."/bitrix/modules/main/include.php");?>
<?
if (CModule::IncludeModule("sale") && CModule::IncludeModule("catalog")){
if (isset($_POST['id'])&&isset($_POST['quantity'])) {
$PRODUCT_ID = intval($_POST['id']);
$QUANTITY = intval($_POST['quantity']);
Add2BasketByProductID(
$PRODUCT_ID,
$QUANTITY,
'VALUE'=>$_POST['roll']
]
]
);
LocalRedirect("/personal/cart/"); //path in your cart
}
else {
echo "No parameters";
}
}
else {
echo "No modules connected";
}
?>