To populate a ComboBox according to a screen field

Hi folks! I'm newbie on ABAP and I have the following problem:
I have a screen field. According with the data entered on this field I want to populate a ComboBox using the function VRM_SET_VALUES, but I can't found a proper event to do the population.
The "at selection-screen on field_name" option is executed at the end, with all checks, but not after I live or change the first field. Anybody knows a solution for it?
Thanks in advance.

Check the below code:
*& Report YSAMPLE12                                                   *
REPORT ysample12                               .
DATA: i_dynpfields TYPE dynpread OCCURS 0 WITH HEADER LINE.
TYPE-POOLS : vrm.
DATA : vrm_data TYPE vrm_values.
DATA : wa_vrm LIKE LINE OF vrm_data.
PARAMETERS : p_val TYPE c.
PARAMETERS : p_opt(10) TYPE c AS LISTBOX VISIBLE LENGTH 10.
AT SELECTION-SCREEN.
REFRESH: i_dynpfields.
i_dynpfields-fieldname = 'P_VAL'.
APPEND i_dynpfields.
CALL FUNCTION 'DYNP_VALUES_READ'
    EXPORTING
      dyname                         = sy-repid
      dynumb                         = sy-dynnr
TRANSLATE_TO_UPPER             = ' '
REQUEST                        = ' '
PERFORM_CONVERSION_EXITS       = ' '
PERFORM_INPUT_CONVERSION       = ' '
DETERMINE_LOOP_INDEX           = ' '
    TABLES
      dynpfields                     = i_dynpfields
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.
    MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
            WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
ENDIF.
AT SELECTION-SCREEN OUTPUT.
REFRESH: vrm_data.
READ TABLE i_dynpfields WITH KEY fieldname = 'P_VAL'.
IF i_dynpfields-fieldvalue = 'A'.
    wa_vrm-key = '1'.
    wa_vrm-text = 'Create'.
    APPEND wa_vrm TO vrm_data.
    wa_vrm-key = '2'.
    wa_vrm-text = 'Change'.
    APPEND wa_vrm TO vrm_data.
    wa_vrm-key = '3'.
    wa_vrm-text = 'Delete'.
    APPEND wa_vrm TO vrm_data.
ELSEIF i_dynpfields-fieldvalue = 'B'.
    wa_vrm-key = '4'.
    wa_vrm-text = 'Copy'.
    APPEND wa_vrm TO vrm_data.
ENDIF.
CALL FUNCTION 'VRM_SET_VALUES'
    EXPORTING
      id              = 'P_OPT'
      values          = vrm_data
    EXCEPTIONS
      id_illegal_name = 1
      OTHERS          = 2.
U have press enter after giving value in the P_VAL.
Regards,
Prakash.

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Cross posted
http://www.coderanch.com/t/582014/JavaFX/java/populate-TableView-data-other-screen
http://stackoverflow.com/questions/10734649/how-to-populate-tableview-data-on-the-other-screen-textfield-in-javafx-2-0
Moderator advice: Please read the announcement(s) at the top of the forum listings and the FAQ linked from every page. They are there for a purpose.
Then edit your post and format the code correctly.
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Get all fotter details in a internal table
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ENDLOOP. */
Comment this for a while and
Change the code as
t_dynfields1-fieldname = ' '. "<--- header name
t_dynfields1-fieldvalue = ' '."<----val
append t_dynfields1.
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t_dynfields1-fieldvalue = ' '.
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t_dynfields1-fieldname = ' '.
t_dynfields1-fieldvalue = ' '.
append t_dynfields1.
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CALL FUNCTION 'DYNP_VALUES_UPDATE'
EXPORTING
dyname = d020s-prog
dynumb = d020s-dnum
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dynpfields = t_dynfields1.
regards,
vijay

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If you face same problem then please let me know.
module display_f4help input.
call function 'F4IF_FIELD_VALUE_REQUEST'
    exporting
      tabname           = '<tablename>'
      fieldname         = '<fieldname>'
      dynpprog          = sy-cprog
      dynpnr            = sy-dynnr
      dynprofield       = '<screen-field name>'
    exceptions
      field_not_found   = 1
      no_help_for_field = 2
      inconsistent_help = 3
      no_values_found   = 4
      others            = 5.
if sy-subrc <> 0.
    message id sy-msgid type 'S' number sy-msgno
    with sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
endif.                                     " IF sy-subrc <> 0.
endmodule.                             " DISPLAY_F4HELP INPUT

To populate a ComboBox according to a screen field

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