The diagram below shows TECHNICAL process for deployment of SAP S/4HANA Readiness-Check.
These steps are of initial days of S/4HANA readiness check. Today the Readiness-Check is prerequisit and called in prepration-stage of SAP S/4HANA Migration-Start.

consistency check classes are delivered via the central TCI-based SAP Note 2502552 and other notes which have been set as prerequisite of 2502552 it can be executed standalone for both the relevancy and consistency check. In addition, it can also be executed by SAP Readiness Check and Software Update Manager (SUM)
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Thanks for info.
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