how to perform master data validation in selection screen fields

[Sandra_Rossi]

screenshot-2023-03-25-132654.png how to implement that in report and write any sample code so it will be helpful for me and I attached screenshot

[Sandra_Rossi]

Please embed the images instead of proposing hyperlinks, it's more user-friendly (allows reading without need of clicking and seeing images on separate screens).

[vulturas4]

SELECT-OPTIONS: foo FOR bar OBLIGATORY.

If you want to validate non-mandatory input fields, you should write a validation form/method/class.

Kind regards

Jürgen