SAP Message PU002 - The entered target client & is invalid

Diagnosis
The value &V1& is not a valid client because it is not contained in thetable for all clients, T000, or is not only composed of numbers. Validclient names are 3-digit numbers (000 to 999) that are entered in tableT000.

System Response
The import into the selected target client is not performed.

Procedure
Select a valid target client.