There is currently no functionality in RIO to reverse an AWOL discharge once it has been recorded.
Resolution
This capability would need to be raised as a product enhancement request.
Please submit your idea via the Ideas Portal (Aha):
https://theaccessgroup-accessrioepr.ideas.aha.io/
Enhancement requests submitted through the portal can be reviewed and voted on by customers and will be considered by the RIO Change Board for potential development.