How to create a F4 help for a screen field

You can use the FM 'F4IF_INT_TABLE_VALUE_REQUEST' to call a F4 help screen.

 

Call this screen at event :

at selection-screen

at selection-screen on value-request for FIELD.

 

CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST'
      EXPORTING
        retfield    = Name of return field in FIELD_TAB

        dynpprog    = Current program name
        dynpnr      = screen number

        dynprofield = Name of screen field for value return
        value_org   = Value return: C: cell by cell, S: structured
      TABLES
        value_tab   = Table of values: entries cell by cell
        return_tab  = Return the selected value