The latest versions of the Group and GroupDiscuss modules include tools for transferring topics between forum categories, discussion categories and group discussions. This is the culmination of a custom module development sponsored by and , so thanks to them.
It does mean that this custom module, jrXGroupDiscussionXfer, is now redundant and will no longer be supported. If you do have this module installed on your site, please make sure you are running the latest Group and GroupDiscuss modules then disable/delete the custom module.
Paul Asher - JR Developer and System Import Specialist