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@dvillasmil04 I finally found the issue. There was another plugin conflicting with WPC Product Bundles. Luckily, they released an update with a fix for the problem. The plugin is called B2B Market by MarketPress. v2.1 solved the issue.

Unfortunately, it won’t even donwload a html file. -> https://take.ms/qWVRQ
And yes, also I completely deactivated the caching plugin and tried to generate and download a new label. But it still won’t work.

Dear @gmwp1111 thanks for your suggestion. I’m using WP-Optimize Premium 3.1.12. To test your suggestion, I deactivated all settings, and cleaned out the .htaccess, but nothing changed. The error still occurs. Also your suggestion, @shadim, didn’t succeed. Do you have any other idea?

Thanks for your reply. I created a ticket.

Update: also, the WooCommerce Multilingual claims to need WPML String Translation to be installed. https://take.ms/lQx0Q — But WPML String translation is installed and up to date.

Dear Shadi, thank you very much! It works like a charm now! Also the function you suggested for getting the order number was just the right one.

For everybody else: I used the snippet to get the order number that was given by the plugin German Market. Here is the final code that I used:

add_filter('pr_shipping_dhl_label_args', 'modify_order_id_to_number', 10, 2);
function modify_order_id_to_number($args, $order_id) {
 	$order = wc_get_order( $order_id );
	$args['order_details']['order_id'] = $order->get_order_number();
	return $args;
}

Dear Shadi, you very much for the code snippet. I tried it by adding a fixed value ‘123’ to the variable. But the label keeps on showing the order id. See below how I added the ‘123’. Do you see a mistake? I added the snippet at the very end of my functions.php.

add_filter('pr_shipping_dhl_label_args', 'modify_order_id_to_number', 10, 2);
function modify_order_id_to_number($args, $order_id) {
 	$order = wc_get_order( $order_id );
	$args['dhl_settings']['dhl_label_ref'] = '123';
	return $args;
}

Dear Shadi, I’m interested in the same solution. Could you possibly define the exact code of the filter so that I’d only have to set my own variable for the custom order number? This would be highly appreciated.
Thanks

Alright, this answered my question.
Thank you!

Thanks for getting back to me so quickly and for the explanation.

So if I need to factor in refunds I will have to do so by manual adjustments. Do I understand right?

At the main site of the network, the button is available at ‘Users->User Role Editor’. At any other site of the network it won’t show up. Do I also need the Pro version for that?

Dear Vladimir, Thanks for your reply.

I’m working with a multisite installation and I’m logged in as superadmin. On the network level Users->User Role Editor doesn’t show up. Do I need to acitvate this option? I also granted ‘ure_reset_roles’ capability to the administrator role. But the ‘Reset’ button still doesn’t show up. Any other ideas?

Thanks for your help!