Custom F4 Help on Selection Screen

We can provide custom F4 help for any input fields on selection screen using the function module F4IF_INT_TABLE_VALUE_REQUEST in AT SELECTION-SCREEN ON VALUE-REQUEST FOR field event.

TYPES: BEGIN OF ty_matnr,
       matnr TYPE makt-matnr,
       maktx TYPE makt-maktx,
       END OF ty_matnr.
*--------------------------------------------------------------*
*Data Declaration
*--------------------------------------------------------------*
DATA: gwa_matnr  TYPE ty_matnr,
      gt_matnr   TYPE TABLE OF ty_matnr.
DATA: gt_return  TYPE TABLE OF ddshretval,
      gwa_return TYPE ddshretval.
*--------------------------------------------------------------*
*Selection-Screen
*--------------------------------------------------------------*
PARAMETERS: p_matnr TYPE mara-matnr.

*--------------------------------------------------------------*
*Selection-Screen on Value-Request
*--------------------------------------------------------------*
AT SELECTION-SCREEN ON VALUE-REQUEST FOR p_matnr.

  REFRESH gt_matnr.

  gwa_matnr-matnr = 'AAA'.
  gwa_matnr-maktx = 'Dummy Material 1'.
  APPEND gwa_matnr TO gt_matnr.

  gwa_matnr-matnr = 'BBB'.
  gwa_matnr-maktx = 'Dummy Material 2'.
  APPEND gwa_matnr TO gt_matnr.

  gwa_matnr-matnr = 'CCC'.
  gwa_matnr-maktx = 'Dummy Material 3'.
  APPEND gwa_matnr TO gt_matnr.

  CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST'
    EXPORTING
      retfield        = 'MATNR'
      value_org       = 'S'
    TABLES
      value_tab       = gt_matnr
      return_tab      = gt_return
    EXCEPTIONS
      parameter_error = 1
      no_values_found = 2
      OTHERS          = 3.

  READ TABLE gt_return INTO gwa_return INDEX 1.
  IF sy-subrc = 0.
    p_matnr = gwa_return-fieldval.
  ENDIF.

Selection Screen Output