Diagnosis
Another user has already activated one or more of the possible traces.As the trace can only be activated for one or all users, you cannotactivate the trace at the present time.

System Response
After the message the system continues working.

Procedure
Wait until the trace has been deactivated by the user.
If necessary contact the user who activated the trace. You can find theuser name on the screen "Trace requests" (initial screen of thetransaction) under the heading "State of traces".