How to modify F4 help of one parameter based on the value of another?

Question

Hi,
My Query is as follows:
I have 3 select-options / parameters on the selection screen.
If I enter some value in the first parameter the values in the second parameter should reflect accordingly.
For example: The 3 selection-screen parameters are:
select-options: s_werks for pa0001-werks no intervals,
                      s_btrtl for pa0001-btrtl no intervals,
                      s_kostl for pa0001-kostl no intervals.
On exceuting the report, say I do a F4 and select '1000' for the first parameter (s_werks).
Now after selecting the value for the first parameter if I do a F4 on the second parameter (s_btrtl) then it should prompt me with a F4 help containing values only corresponding to '1000' entered in s_werks and not all the values maintainined for btrtl.
I have tried AT SELECTION-SCREEN ON VALUE-REQUEST FOR S_BTRTL-LOW.
And then used the FM F4IF_INT_TABLE_VALUE_REQUEST.
But At Selection-Screen On Value Request the selection screen parameter s_werks does not show any value. It reflects the value only once it reaches Start-of-selection.
Can anyone please guide me how to go about it?

Answer 1

hi
Please do it in this way..
TABLES: pa0001.
select-options: s_werks for pa0001-werks no intervals,
s_btrtl for pa0001-btrtl no intervals,
s_kostl for pa0001-kostl no intervals.
AT SELECTION-SCREEN ON VALUE-REQUEST FOR S_BTRTL-LOW.
  PERFORM sub_pop_btrtl .
*&      Form  sub_pop_btrtl
      text
-->  p1        text
<--  p2        text
form sub_pop_btrtl .
DATA :  l_wa_dynp TYPE dynpread,
        l_i_dynp TYPE STANDARD TABLE OF dynpread,
        l_wa_temp LIKE LINE OF S_werks.
REFRESH s_temp[].
  l_wa_dynp-fieldname = 'S_WERKS-LOW'.
  APPEND l_wa_dynp TO l_i_dynp.
Get the screen values of template
  CALL FUNCTION 'DYNP_VALUES_READ'
    EXPORTING
      dyname               = sy-repid
      dynumb               = sy-dynnr
    TABLES
      dynpfields           = l_i_dynp
    EXCEPTIONS
      invalid_abapworkarea = 1
      invalid_dynprofield  = 2
      invalid_dynproname   = 3
      invalid_dynpronummer = 4
      invalid_request      = 5
      no_fielddescription  = 6
      invalid_parameter    = 7
      undefind_error       = 8
      double_conversion    = 9
      stepl_not_found      = 10
      OTHERS               = 11.
  IF sy-subrc <> 0.
Do Nothing
  ENDIF.
Put the screen value in the select-options
  READ TABLE l_i_dynp INTO l_wa_dynp INDEX 1.
  l_wa_temp-sign = 'I'.
  l_wa_temp-option = 'EQ'.
  l_wa_temp-low = l_wa_dynp-fieldvalue.
Now you use l_wa_temp as plant field
endform.                    " sub_pop_btrtl