Hi,

In the basic_cart_order submodule, there is a basic_cart_order_details.tpl.php template file which is used in admin/structure/orders/[order-id] page.
I've tried customizing the template file by copying it to the templates folder of my theme but it is not used.
Even renaming the file by replacing the underscores by dashes (-> basic-cart-order-details.tpl.php) doesn't help.

Any clue?