Parameter como listbox, datos fijos

Me solicitaron mostrar por un parámetro de entrada, unos valores fijos (30, 60, 90, 120), así que tomé un Parameter, y con una función (VRM_SET_VALUES) cargamos los datos que queremos que seleccione el usuario.

*TOP:
PARAMETERS P_FXDT AS LISTBOX   LENGTH 3  VISIBLE LENGTH 10 OBLIGATORY .

AT SELECTION-SCREEN OUTPUT.

  DATA:
    lv_name  TYPE vrm_id,
    lt_list  TYPE vrm_values,
    lv_value TYPE vrm_value.

  lv_name = 'P_FXDT'. " Respetar mayúsculas
  lv_value-key = '30'.
  lv_value-text = 'Días'.
  APPEND lv_value TO lt_list.

  lv_value-key = '60'.
  APPEND lv_value TO lt_list.

  lv_value-key = '90'.
  APPEND lv_value TO lt_list.

  lv_value-key = '120'.
  APPEND lv_value TO lt_list.

  CALL FUNCTION 'VRM_SET_VALUES'
    EXPORTING
      id              = lv_name
      values          = lt_list
    EXCEPTIONS
      id_illegal_name = 0
      OTHERS          = 0.

"Fuente: https://answers.sap.com/questions/3608701/parameter-as-list-box.html

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