Select-Options übernimmt Wertehilfe-Wert nicht

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AT SELECTION-SCREEN ON VALUE-REQUEST FOR s_stat-low.

  CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST'
    EXPORTING
      ddic_structure         = 'TJ02T'
      retfield               = 'ISTAT'
*   PVALKEY                = ' '
      dynpprog               = f_repid
      dynpnr                 = '1000'
      dynprofield            = 'S_STAT-LOW'
      stepl                  = 0
*   WINDOW_TITLE           =
      value                  = 'F'
      value_org              = 'S'
      multiple_choice        = 'X'
      display                = 'F'
      callback_program       = f_repid
*   CALLBACK_FORM          = ' '
*   MARK_TAB               =
* IMPORTING
*   USER_RESET             =
    TABLES
      value_tab              = t_values
*   FIELD_TAB              =
*   RETURN_TAB             =
*   DYNPFLD_MAPPING        =
   EXCEPTIONS
     parameter_error        = 1
     no_values_found        = 2
     OTHERS                 = 3
            .
  IF sy-subrc <> 0.
* MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*         WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
  ENDIF.

*AT SELECTION-SCREEN.
  LOOP AT SCREEN.
    CHECK screen-name = 'S_STAT-LOW'.
    screen-intensified = '1'.
    MODIFY SCREEN.
  ENDLOOP.