Diagnosis
If one of the performance traces is already activated for a user, it isnot possible to activate a trace for another user on the sameapplication server. However, the trace can be activated for a group ofusers.
The RFC trace has already been activated for the specified user.

Procedure
Wait until the other user deactivates the trace. You can then activatethe trace. You can also activate the trace for all users, or for userswhose names match a pattern. When doing so, specify the pattern in theusual format.
You can activate the trace for multiple users by choosing the "ActivateTrace with Filter" button.