Prob to fill 2 screen fields thru F4 help on one screen field

Hi,
I have 2 fields on selection screen - MATNR and MTART. I want to have F4 help on MATNR only and based on the value selected I need to fill the MTART field also. I am using FM : F4IF_INT_TABLE_VALUE_REQUEST.
I found on net that it can be done using either DYNPFLD_MAPPING or CALLBACK_FORM. I used both one by one but did not get the required result. Only the P_MATNR is getting populated after F4 and not P_MTART.
My code is as below:
TYPES: BEGIN OF ty_mara,
        matnr TYPE matnr,
        mtart TYPE mtart,
       END OF ty_mara.
DATA: i_tab TYPE STANDARD TABLE OF ty_mara,
      i_return TYPE STANDARD TABLE OF ddshretval,
      record_tab TYPE STANDARD TABLE OF seahlpres,
      i_map TYPE STANDARD TABLE OF dselc,
      wa_map TYPE dselc.
SELECTION-SCREEN BEGIN OF BLOCK a.
PARAMETERS: p_matnr TYPE matnr,
            p_mtart TYPE mtart.
SELECTION-SCREEN END OF BLOCK a.
AT SELECTION-SCREEN ON VALUE-REQUEST FOR p_matnr.
SELECT matnr
         mtart
    FROM mara
    INTO TABLE i_tab
    WHERE mtart = 'FERT'.
wa_map-fldname = 'MTART'.
wa_map-dyfldname = 'P_MTART'.
APPEND wa_map TO i_map.
CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST'
    EXPORTING
    DDIC_STRUCTURE         = ' '
      retfield               = 'MATNR'
    PVALKEY                = ' '
     dynpprog               = sy-repid
     dynpnr                 = sy-dynnr
     dynprofield            = 'P_MATNR'
    STEPL                  = 0
    WINDOW_TITLE           =
    VALUE                  = ' '
     value_org              = 'S'
    MULTIPLE_CHOICE        = ' '
    DISPLAY                = ' '
     callback_program       = sy-repid
     CALLBACK_FORM          = 'F4CALLBACK'
    MARK_TAB               =
IMPORTING
    USER_RESET             =
    TABLES
      value_tab              = i_tab
    FIELD_TAB              =
     return_tab             = i_return
     dynpfld_mapping        = i_map
   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.
ELSE.
ENDIF.
FORM F4CALLBACK
     TABLES   RECORD_TAB STRUCTURE SEAHLPRES
     CHANGING SHLP TYPE SHLP_DESCR
              CALLCONTROL LIKE DDSHF4CTRL.
DATA: INTERFACE LIKE LINE OF SHLP-INTERFACE.
INTERFACE-VALTABNAME = 'DYNP'.
INTERFACE-VALFIELD = 'P_MTART'.
MODIFY SHLP-INTERFACE FROM INTERFACE
         TRANSPORTING
        VALTABNAME
         VALFIELD
         WHERE SHLPFIELD = 'MTART'.
ENDFORM.
I may be missing something... Please help me.

Hi ,
Please go though this thread.
[Re: F4_int_table_value_request]
This will solve your issue.
Regards
DKS

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https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/daeda0d7-0701-0010-8caa-
edc983384237
http://help.sap.com/saphelp_nw04/helpdata/en/cf/21ee93446011d189700000e8322d00/frameset.htm
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Chris Paine wrote:
It seems to me - given that your code is in wddomodifyview that you are trying to have different dropdowns per row
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[Pre-selection (F4 icon on the field in table)|http://imagebin.ca/view/npIsaqF.html]
[Value Help popup for the field ZZ_PROLE_R3|http://imagebin.ca/view/8fZUh3T.html]
[Result by now |http://imagebin.ca/view/3PaqdvE.html]
[Result I'd like to have.|http://imagebin.ca/view/dExR0J.html]
Chris Paine wrote:
However - by your comment on the "value help dialog box" I am guessing you are using an input field? If this is the case then I would strongly suggest that you change/enhance the structure of the context node THCUS (btw, better coding practise to refer to it as wd_this->wdctx_thcus when using the get child node construct) so that you refer to an actual SAP ddic search help, if you then associate in the structure the value and text fields then populating the text field should happen automatically. Also you'd have the nice side effect that your value help dialog would be named after the associated ddic search help.
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Chris Paine wrote:
I realise that this is rather a lot - so if you have any specific question please do respond - hopefully I or someone else will be able to clarify.
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