Due Date not setting correctly

I need Due date set to the default 24 hours when a ticket comes in and change anytime the priority is change and/or a reply is sent, but for some reason it only seems to work with tickets created from within RT and by reply to tickets that were emailed in. And even then, the due date resets back to “Not Set” If priority is changed and a reply isn’t sent.

Any suggestions?

David Hollinger III
IT Infrastructure Coordinator
Handwriting Without Tears
(301)263-2700 ext 285