Diagnosis
You tried to execute the test function Save client SE. You canonly execute this function on the enqueue (lock) server. You are loggedon to another R/3 server.

System Response
The system does not execute the function.

Procedure
RESET N1
Determine the name of the enqueue server. To do this, in the lockmanagement (Transaction SM12) choose Extras -> Diagnosis. Thefirst line in the list displayed states the enqueue server.
Use the Server selection function in the SAP logon program tolog onto the enqueue server.
Repeat the operation in the lock management.