Im using the latest Woocommerce version with HPOS. To avoid orders created vie the admin panel (backend) with values i need unconditional i tried to create a function which stops creating the order if the billing postalcode is empty and no propduct is added to the order. Unfortunatle i can save / create the order if i only add the postalcode – it should not save the order if any of these two are not set.

Here my code – any idea how to fix it?

        // During Order creation in the admin area - force to set at least one procduct and billing postalcode to avoid issues on the order overview screen and more
    function avoid_orders_wout_b_postalcode_a_wout_products_9sadfM324($post_id, $post) {

        // Get the order object
        $order = wc_get_order($post_id);
        
        // Check if the order has products
        $items = $order->get_items();
        if (empty($items)) {
            // Add an error message to WooCommerce admin notices
            WC_Admin_Notices::add_custom_notice('no_products_added_error', 'ERROR YCNC0084 - ' . __('You cannot create an order without adding any products', 'nm-framework'));
            // Redirect to the edit order screen
            wp_redirect(admin_url('post.php?post=' . $post_id . '&action=edit'));
            exit;
        }

        // Check for postal code in billing and shipping address
        $billing_postcode = $order->get_billing_postcode();
        // $shipping_postcode = $order->get_shipping_postcode();

        // if (empty($billing_postcode) && empty($shipping_postcode)) {
         if ( empty($billing_postcode) ) {
            // Add an error message to WooCommerce admin notices
            WC_Admin_Notices::add_custom_notice('no_billing_postalcode_error', 'ERROR YCNC0024 - ' . __('You cannot create an order without a billing postal code', 'nm-framework'));   
            // Redirect to the edit order screen
            wp_redirect(admin_url('post.php?post=' . $post_id . '&action=edit'));
            exit;
        }

    }
    add_action('woocommerce_process_shop_order_meta', 'avoid_orders_wout_b_postalcode_a_wout_products_9sadfM324', 99, 2); // must higher then 40 according to /a/59726544/11946596