Error found when enabling BCUI when Employee Central is not enabled.
Employee Profile - People Profile
Reproducing the Issue
In the data model, you need to check sysAllUserDirectorySetting list to see if there is elements which are unused in the list.
When there is unused elements , this can cause manage business configuration to be locked which shows the error message. See KBA for more details on error - 2324339
1. You need to compare the list against the elements being used.
2. When the unused element is found, remove it.
3. Reimport the data model.
4. For further details on this process see the following KBA - 2618236
Manage business configuration, locked , KBA , LOD-SF-EP , Employee Profile , Problem