Launching Web ADI from HR forms throws a http 404 error under Internet Explorer. Firefox shows a more meaningful "Resource /OA_HTML/oracle.apps.bne.webui.BneApplicationService not found on this server".
After some digging, it was found that the web html call of seeded and custom Web ADI forms functions had 'oracle.apps.bne.webui.' before 'BneApplicationService'.
It looks like the upgrade scripts do not clean that up correctly.