Custom Input Help

Below is the custom help for selection options we need to define s-low and s-high withe separated input help

    SELECT t588b~massn
     INTO CORRESPONDING FIELDS OF TABLE i_acthelp
    FROM t588b
    WHERE t588b~USERG = '14'
    AND t588b~massn NE ''.

  LOOP AT i_acthelp.
    SELECT SINGLE mntxt FROM t529t INTO i_acthelp-mntxt
      WHERE  sprsl ='EN' AND
       massn = i_acthelp-massn.
      MODIFY i_acthelp.
  ENDLOOP.

  CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST'
    EXPORTING
*     DDIC_STRUCTURE         = ' '
      RETFIELD               = 'MASSN'
*     PVALKEY                = ' '
*     DYNPPROG               = ' '
*     DYNPNR                 = ' '
*     DYNPROFIELD            = ' '
*     STEPL                  = 0
     WINDOW_TITLE           =  'Action Type'
*     VALUE                  = ' '
     VALUE_ORG              = 'S'
*     MULTIPLE_CHOICE        = ' '
*     DISPLAY                = ' '
*     CALLBACK_PROGRAM       = ' '
*     CALLBACK_FORM          = ' '
*     CALLBACK_METHOD        =
*     MARK_TAB               =
*   IMPORTING
*     USER_RESET             =
    TABLES
      VALUE_TAB              = i_acthelp
*     FIELD_TAB              =
     RETURN_TAB             =  it_return
*     DYNPFLD_MAPPING        =
*   EXCEPTIONS
*     PARAMETER_ERROR        = 1
*     NO_VALUES_FOUND        = 2
*     OTHERS                 = 3
            .
  IF SY-SUBRC <> 0.
* Implement suitable error handling here
  ENDIF.

  READ TABLE it_return INTO wa_return INDEX 1.
  S_ACTYPE = wa_return-fieldval.