Error in badi ME_GUI_PO_CUST for ME21n/22n/23n

Dear All,
I want to add 1 tab in ME21n/22n/23n.
In that 2 field in EKKO table using ci_ekkodb include is add
For that I use badi ME_GUI_PO_CUST.
in that
MAP_DYNPRO_FIELDS
TRANSPORT_FROM_MODEL
TRANSPORT_TO_DYNP
TRANSPORT_FROM_DYNP
TRANSPORT_TO_MODEL
these method find error do to field name passing.
method IF_EX_ME_GUI_PO_CUST~MAP_DYNPRO_FIELDS.
FIELD-SYMBOLS: <mapping> LIKE LINE OF ch_mapping.
    LOOP AT ch_mapping ASSIGNING <mapping>.
      CASE <mapping>-fieldname.
        WHEN 'ZZDEPT'.                                            " Field Name
          <mapping>-metafield = mmmfd_cust_03.
        WHEN 'ZZPOGR'.                                            " Field Name
          <mapping>-metafield = mmmfd_cust_04.
      ENDCASE.
    ENDLOOP.
endmethod.
Referening **************** - Step by step guide on adding a new tab in ME21N using a BADI
Replay is appreciable.
Regards,
Pooja

First you go to se18 and read documentation of this badi.
You have to implement BAdI ME_PROCESS_PO_CUST before implementing this BAdI.
Sample code is available here.... goto->sample code->display
In case any doubt u ask..
Regards
Sreekanth

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Moderator message - Duplicate post locked
Edited by: Rob Burbank on Jul 10, 2009 12:10 PM

check the answer
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Hi...I hv similar requirement.
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DATA: ls_subscriber LIKE LINE OF re_subscribers.
we want to add a customer subscreen on the item detail tab
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*- customer fields
CONSTANTS: mmmfd_cust_01 TYPE mmpur_metafield VALUE 90000000.
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