Hi,
Please check below article:
Symantec AntiVirus scheduled scans continue to run after migrating to Symantec Endpoint Protection:
http://www.symantec.com/docs/TECH103868
It is mentioned that the "SymRmvScan" utility is designed to remove unidentified scans in existing Symantec Endpoint Protection client installations.
So it will remove all the unidentified scan from the registry & only the one assigned to the client will work properly. that's what my understanding..