SAP Message RA283 - An entry already exists for system &

Diagnosis
You are already monitoring the whole system. You now want to monitorindividual application servers for this system. This message informs youthat, if you continue, you will have redundant displays of thisapplication server in the alert monitor. This is because monitoring thesystem, as you have already done, automatically includes monitoring ofthe application server.

Procedure
SAP recommends that you do not monitor this application server twice.However, if you want a redundant display of this application server, youcan ignore this message and continue.