Client 000
The SAP reference client contains tables with default settings but no master data.
Client 000 can be copied, using the client copy function, to create the clients
that will be used in the implementation. For important configuration work, you
will need to log on to SAP Client 000. This client must be used to configure the
Correction and Transport System (CTS). Client 000 also plays an important role
in upgrade processes. Each time an SAP customer upgrades its system, clientdependent
changes automatically will be upgraded into Client 001, the production
preparation client, and the changes then can be copied to other clients. Neither
Client 000 nor Client 001 should be removed from the system.