Hello, This problem occurred due to a missed side effect from the following fix listed under Resolved Issues in 4.1.3:
33305029 DE553877 When a user inherits a CM group and is an approver for a PVP, modifying the user displays error PAM-CMN-0155.
It should affect users that have a CM group membership assigned that is not assigned on the user group level. The solution is to upgrade to 4.1.5+. As a workaround, the following procedure should allow you to update the user:
1- Create a local group with the same roles and CM groups that the user currently has.
2- Add the user to the user group.
3- Update the user to make the desired changes.
4- Go back to the user group and remove the user.
5- Delete the temporary user group.