Employee Central is enabled but user does not want to use manager field.
SuccessFactors Employee Central
Reproducing the Issue
Customer wants to use the manager as a standard element even though Employee Central is enabled.
When EC is enabled, EC is the controller for all Roles managed in the system (Manager, HR Manager, Custom Manager, etc).
You must not disable this manager field in EC Job Info and need to plan to manage all manager changes via Job Information and not the EP field for Manager.
Manager Field Permission , KBA , LOD-SF-EC , Employee Central , Problem