3675534 - Error "UCON RFC Rejected" occurs when setting the Reference Check System in transaction SCI

Symptom

It's planned to use SAP BTP ABAP environment as ATC central check system and run ATC checks from an On-Premise system against this system(ATC Developer Scenario).
The error below happens when setting the reference check system in transaction SCI on the checked system:

UCON RFC Rejected; CALLER_SID:<SID> CALLER_CLIENT:<nn> CPROG:CL_CI_INSPECTION==============CP DEST:<RFC destination> CALLER_USER:

Environment

SAP Netweaver Release 740 - 758

Product

SAP ERP 6.0 ; SAP NetWeaver 7.4 ; SAP NetWeaver 7.5 ; SAP S/4HANA 1610 ; SAP S/4HANA 1709 ; SAP S/4HANA 1809 ; SAP S/4HANA 1909 ; SAP S/4HANA 2020 ; SAP S/4HANA 2021 ; SAP S/4HANA 2022 ; SAP S/4HANA 2023 ; SAP S/4HANA, on-premise edition 1511

Keywords

BTP ABAP environment, SCI, reference check system, UCON RFC Rejected, CALLER_SID, CALLER_CLIENT, CL_CI_INSPECTION==============CP , KBA , BC-DWB-TOO-ATF , ABAP Check Frameworks - ABAP Test Cockpit, Code Inspector , Problem

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