I'm using combo offer woocommerce plugin to make a bundle product with specific item number of linked products. I had unchecked this option: "Buyer can change the quantity of combo products?" so when I head to the product page I see really that I can't modify the items quantities. But when I add the product to cart then view the cart it shows the quantities of included items of the combo product are able to be changed: How can I prevent that please? I've added this code to my activated plugin: add_filter('woocommerce_cart_item_quantity', 'disable_quantity_change_for_combo_products', 10, 3); function disable_quantity_change_for_combo_products($product_quantity, $cart_item_key, $cart_item) { // Check if the product type is 'wooco' (Combo Offer). if (isset($cart_item['data']) && 'wooco' === get_post_meta($cart_item['data']->get_id(), '_product_type', true)) { // Disable quantity input field by returning a hidden input field. return '<input type="hidden" name="cart[' . esc_attr($cart_item_key) . '][qty]" value="' . esc_attr($cart_item['quantity']) . '" />'; } return $product_quantity; } But it did not help.