Calling a subscreen in a ME22N from an user exit

Hi Experts,
i added a custom field in the 'Customer data' tab of transaction ME21N/ME22N.
i coded its validation in exit 12. for its validation i am displaying a warning message using fm 'POPUP_TO_CONFIRM'.
now the requirement is that when the user selects option 'No' in the popup, the cursor should automatically go to the custom field in the screen 'customer' tab even when we are in a different screen.
please let me know how to achieve this by coding the logic in the user exit. also, the screen for customer tab is a subscreen.
Thanks
Aditi

i tried using FM ABAP4_CALL_TRANSACTION and tried to pass a recording in
   CALL FUNCTION 'ABAP4_CALL_TRANSACTION'
STARTING NEW TASK 'VA02'
DESTINATION 'NONE'
    EXPORTING
      tcode                         = 'VA02'
*     skip_screen                   = 'X'
     mode_val                      = 'N'
*   UPDATE_VAL                    = 'A'
* IMPORTING
*   SUBRC                         =
   TABLES
     using_tab                     = i_bdc2
*   SPAGPA_TAB                    =
     mess_tab                      = i_msg2
   EXCEPTIONS
     call_transaction_denied       = 1
     tcode_invalid                 = 2
     OTHERS                        = 3
its working when i give the mode as "A", but then it runs like a recording.

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Calling a subscreen in a ME22N from an user exit

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