P6 EPPM 24 – Unable to Save Changes When Modifying User Module Access (Existing and New Users)

Problem Description

We are experiencing an issue in Oracle Primavera P6 EPPM 24 where user permission (Module Access) changes cannot be saved, while user creation works normally.

Observed Behavior

1. Creating a new user
   • User creation completes successfully.
   • The user record is saved without any errors.
2. Modifying user permissions (Module Access)
   • When changing module access permissions (e.g. P6 Professional, P6 Analytics, Enterprise Reports, etc.) for:
     • Existing users
     • Newly created users
   • "Unable to save changes. An unknown error has occurred."
   • The changes are not saved.

This issue occurs consistently regardless of whether the user is newly created or already existing.