This is a clone from DIRSRV-55:

Description of problem:
In Replication -> Configuration -> Add Replication Manager if I create replication manager DN e.g. "cn=replication manager,cn=config" and then attempt to create another manager with same DN, I will get success message for creating the entry.
Like this I can create replication manager with different/same password as many times as I want.
It would be better to throw error message that user is trying to create duplicate entry and maybe do a button to edit existing replication manager (change password etc.).

Version-Release number of selected component (if applicable):
cockpit-196.2-1.el8.x86_64
cockpit-389-ds-1.4.1.8-1.module+el8dsrv+4209+f45880df.noarch