Hi,
In this blog I want to highlight one issue which we face after S4 hana conversion "SAP S4/HANA 2020 [02 (05/2021) FP ]".
After successful conversion to S4 hana one error comes on F4 help on all screens. Internal error on F4 help..

F4 help internal table error

This error is coming because of older version of SAP GUI.
Solution.
Please update the sap gui to latest available version. This will resolve the issue.

SAP GUI version
After updating SAP GUI this issue was not coming and all help screens are working fine.
F4 help error