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[Moritz_Bunkus]

There’s an official knowledge base entry that deals with removing LDAP schema extensions and getting rid of the attributes provided by those extensions:

Remove LDAP schema extensions

Abstract Several apps include their own LDAP schema extensions. They are automatically registered with the UCS LDAP servers on installation. On de-installation they are not removed automatically. They can be only removed if no LDAP objects use definitions from the schema extensions any longer. Warning The following procedure should be done by experienced administrators only. An error may severely damage your domain. The procedure should be performed in a test environment before working in the…