Readiness Check for Upgrade (S/41909 to S/42021)

Hello,

I'm trying to run Readiness Check for "Upgrade" on S/4 1909 system. I've followed the SAP note "3059197 - SAP Readiness Check for SAP S/4HANA upgrades" and implemented all required notes.

Now when executing the program RC_COLLECT_ANALYSIS_DATA, the following erro occurs and I cannot Schedule Analysis: "The system is already a SAP S/4HANA system. This is not supported.The system is not a SAP ERP system. This is not supported.".

How can I run the RC for Upgrade in a system alredy in S/4 ? Thank you.