in the page ./admin/includes/languages/english/edit_orders.php I have

Code:
define('TEXT_DATE_ORDER_ADDNEW', 'Add product.');
and then in ./admin/edit_orders.php

Code:
//   Add Products Steps
all I really know is that my version of edit_orders is rather fresh, within the last month. And I have "super orders" installed too since I mainly test and develop nowadays and there's no problems with compatibility.

Philip.