Associating F4 help to input fields in popup using 'ON VALUE-REQUEST FOR' ?

Hi,

I am working on large program with multiple screens and subroutines. My requirement is to associate similar F4 help to multiple input fields on the same popup screen, whereas the subroutine to be attached is present in a different include file. The pop-up screen is of normal screen type but shown like a popup. What is the best way to associate F4 help for the input fields ? Can someone guide me ?

1. With "AT SELECTION-SCREEN ON VALUE-REQUEST FOR <Inputfield>" by calling the perform statement.

2. Go for custom search help by creating a new one and associate it

3. Some other option.

Thanks.