System copy: RZ21 MTE has source SID and not the target SID

An system copy of PRD to QAS environment has been performed.

Since then receive the following message in the CCMS Monitor sets (trx RZ20):

Unable to determine the name of MTE class from <SID>\Background\...\SAP_SRT_COLLECTOR_FOR_MONITORIN or the message "Failed to determine MTE information for system QAS"

Checked and in the transaction RZ21 the MTE class is pointing to the PRD system and not to the QAS system:

RZ21 -> MTE-specific properties

Monitoring: Properties Assigned to MTEs

RZ21 -> Methods assigned to specific MTEs

Monitoring: Properties and Methods

Unable to determine the name of MTE class from PRD\Background\...\SAP_SRT_COLLECTOR_FOR_MONITORIN

I would expect here the value "QAS\Background\...\SAP_SRT_COLLECTOR_FOR_MONITORIN".

How can I adjust the MTE to check the QAS instead of the source system PRD ?