How to populate dropdown without triggering PAI event ?

Hi,
I have a screen with two fields- One input field and one drop down list field which has to be populated based on the value given in the first field.
How can I populate the drop down list dynamically based on first input field without pressing enter ( i.e with out triggering PAI event ) . I tried using DYNP_VALUES_READ in value request event.
Please give me your suggestions .

Hhhhmm, I thought initially it should work, but I must admit I couldn't get it to work with a listbox. I just tried a simple report with selection screen, see below. Just enter something for the first parameter and then choose the value help for the second field. You will see that it will pick up the value from the first field, if we don't use a listbox.
Once you comment in the coding the LISTBOX and replace it with the normal field, you can see that the value help works as one would hope. It seems that the problem is that the values for the dropdown list get populated too early (i.e. start-up of the report). I don't have the time at the moment to check this out further, but I'm assuming others must have tried this before. Any comments?
REPORT zvaluehelp.
PARAMETERS:
p_statva TYPE stacust-statva,
p_status TYPE stacust-status AS LISTBOX VISIBLE LENGTH 3. " Doesn't work
* p_status TYPE char1. " Value-help works for this
AT SELECTION-SCREEN ON VALUE-REQUEST FOR p_status.
PERFORM value_help.
FORM value_help.
DATA:
    dynpread TYPE dynpread,
    dynpread_tab TYPE STANDARD TABLE OF dynpread,
    stacust TYPE stacust,
    stacust_tab TYPE STANDARD TABLE OF stacust.
dynpread-fieldname = 'P_STATVA'.
APPEND dynpread TO dynpread_tab.
CALL FUNCTION 'DYNP_VALUES_READ'
    EXPORTING
      dyname                   = sy-repid
      dynumb                   = sy-dynnr
      perform_conversion_exits = 'X'
    TABLES
      dynpfields               = dynpread_tab
    EXCEPTIONS
      OTHERS                   = 1.
CHECK sy-subrc = 0.
READ TABLE dynpread_tab INTO dynpread INDEX 1.
CHECK dynpread-fieldvalue IS NOT INITIAL.
SELECT * FROM stacust INTO TABLE stacust_tab
           WHERE statva = dynpread-fieldvalue.
CHECK sy-subrc = 0.
CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST'
    EXPORTING
      ddic_structure = 'STACUST'
      retfield       = 'STATUS'
      dynpprog       = sy-repid
      dynpnr         = sy-dynnr
      dynprofield    = 'P_STATUS'
      value_org      = 'S'
    TABLES
      value_tab      = stacust_tab
    EXCEPTIONS
      OTHERS         = 0.
ENDFORM.
The coding above was just intended as a quick test - so I know it's not proper (i.e. check of return codes, etc.).
Cheers, harald

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