Need to create a validation Function Module

Hi,
I need to create a Validation Function Module.
I have a ITAB into which data comes.
FIELD-SYMBOLS : <ITAB> TYPE ANY ,
                              key      TYPE ANY,
                              char TYPE ANY.
<ITAB> = local_file.
there is a field KEY whose sum when becomes equal to 10.000 for every CHAR,system should show a popup in the below FM
CALL FUNCTION 'POPUP_WITH_WARNING_ALV'
EXPORTING
    TEXTLINE1       = LT_POPUPTEXT
TEXTLINE2       = ' '
TITEL           = 'Warnung'
Please let me know if the requirement is not clear.
Thank U very Much.

Hi annapurna ,
In your case even the KEY value is the most useful one right,
If so go about this way,
have another field flag set it when the sum of the KEY values exceeds 10.
Loop in an internla table.
Now the internal table will have all the data including the flag and now based on the flag (whether set or not) call the function module popup which should retrieve those matnr field where flag is set.
Display the error message saying that the KEY value fr this matnr exceeds 10.
Revert for further clarification.
Thanks and Regards
Srikanth.P

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und
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""Local Interface:
*"       IMPORTING
*"             VALUE(ID) LIKE SPFLI-CARRID DEFAULT 'LH '
*"       EXPORTING
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*"       EXCEPTIONS
*"              NOT_FOUND
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Declaration of Workareas                                             *
DATA: lwa_e1bp2017_gm_item_create TYPE e1bp2017_gm_item_create,
        lwa_data         TYPE edidd, " Work area for IDOC
        lwa_control      TYPE edidc. " Work Area for control rec
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        return_variables      = return_variables
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***INCLUDE LZDTSINT052F_GPOMS_GMF01 .
*&      Form sub_modify_idocdata
Modify the material document item data internal table
FORM sub_modify_idocdata
CHANGING pwa_e1bp2017_gm_item_create TYPE e1bp2017_gm_item_create.
contant declaration
CONSTANTS: lc_261(3) TYPE c VALUE '261'.
DATA : lv_aplzl LIKE resb-aplzl,
         lv_aufpl LIKE resb-aufpl,
         lv_subrc LIKE sy-subrc,
         lv_charg LIKE resb-charg,
         lv_uom LIKE pwa_e1bp2017_gm_item_create-entry_uom.
CLEAR: pwa_e1bp2017_gm_item_create-reserv_no,
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*->> Get SAP storage bin & Storage type from the Z table
SELECT lgtyp lgpla
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IF sy-subrc NE 0.
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Start of insertion for R31K993797
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End of insertion for R31K993797
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                FROM zca_uom_conv
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IF sy-subrc = 0.
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ENDIF.
ENDFORM.                    " sub_modify_idocdata
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     <--P_PWA_E1BP2017_GM_ITEM_CREATE_RE Segment
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Get the reservation and routing number for the order
SELECT SINGLE
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IF sy-subrc = 0.
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ENDFORM.                    " get_oper
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