additional field in program SAPMF05A Screen 300

Dear SAP Master,

I have a requirement to put additional field in program SAPMF05A Screen 300 that is possibly accessed through F-52, F-53, F-04, F-28. After that, I also have a requirement to put additional field in program SAPF110O screen 0300 that is possibly accessed through F110.

Could you please provide me any clue if there is any screen exit / BADI that I could possibly use to implement this requirement?

PS : I've tried to use code block but it requires "Access Key".

Any kind of answer will be highly appreciated.