Fortnox - Stock Amount from QuantityInStock instead of DisposableQuantity

functions.php

<?php
/**
* @snippet WooCommerce - Fortnox plugin by Redlight Media - Hämta lagersaldo från en 'i lager' istället för Disponibelt antal
* @author Redlight Media AB / Christopher Hedqvist
* @compatible WooCommerce 6.8.0
*/
function redlight_fortnox_stock_quantity_in_stock ( $DisposableQuantity, $WC_Product, $fortnox_article ) {
  return $fortnox_article->Article->QuantityInStock;
}
add_filter('obj_fortnox_product_stock_amount', 'redlight_fortnox_stock_quantity_in_stock', 10,3 );