You are operating any number of SAP NetWeaver Application Server Java with User Management Engine (UME), where the respective UME uses directory service as the data source. This means that the user data is also, for example, made available to external systems.
For more information about using a directory service as the data source of the UME, see LDAP Directory as Data Source.
Use the administration tools of the UME. Alternatively, you can also administer the users with the tools of the directory service.
First select the database of the J2EE Engine as the data source during the installation of the J2EE Engine. Then change this configuration by replacing the database with the directory service.