Central User Administration is active, only display of user addresses

What causes this issue?

This system is part of a Central User Administration. User data and
associated addresses can therefore oly by maintained using user
administration in the central system.

System Response

Address data is only available in display mode.

How to fix this error?

The home address of the user's selected default communication type is
used for the mail group. Maintain the addresses using Central User
Administration.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.