SAP has an online simplification item check available. This can be used for both a conversion to S4HANA as well as an upgrade of S4HANA to a higher version.
The readiness check inside the system focuses on data used and on mandatory items.
The online check also gives information on changes and potential new features you can use.
Online simplification item check
The online simplification item check can be found here. On the screen select your target version:
Here we simply take the highest version: S4HANA 2023. A new screen comes where you can select the source version and details of the feature pack of the target:
Click on Go to get the result list:
This check does not replace the mandatory readiness check inside the system. It can help you to prepare in planning phase of an upgrade.