Selection screen - PAI change event upon picking a date

[vincent8]

Is there a way to trigger a PAI event when the user picks a date from the date picker on the selection screen?

I don't want the user to have to hit Enter to trigger it. I want to trigger code right when the value of the date field changes

[Sandra_Rossi]

You may execute any ABAP code when you press F4 (AT SELECTION-SCREEN ON VALUE-REQUEST OF ...), so I guess it should work if you put your own ABAP code after calling F4_DATE.

[vincent8]

But that would trigger when the F4 is clicked, not when the date is entered. So basically, what I want to do is:
When there is a value in field A (the date), I want to hardcode the value of another field B