Adding a dialog after an address check

Question

Hello dear members,
I use SAP CRM 5.0 and have to implement an address check in transaction BP.
I'd like to know which possibilities are there to realize the following:
After having integrated an address check into the transaction BP, which is carried out when the check-button or the save-button is pressed, i'd like to know how to insert a dialog into the transaction itself or better into the BAdi i've implemented.
The dialog should appear when the check revealed some mistakes and asks the user if he'd like to save the data anyway.
So the questions are is there a dialog component (like in delphi or c#) which can do that and if not how can one implement such a component, where should the dialog be invoked (in the BAdi itself, somewhere after the BAdi or somewhere in the PBO)
Thank you very much in anticipation and greetings,
Paul

Answer 1

Thank you for the hint. I did so and tried to exit the processing when no and cancel are pressed but i failed.
Within the method "IF_EX_ADDRESS_CHECK~ADDRESS_POSTAL_CHECK" as an implementation of the ADRESS_CHECK BAdi Interface i coded the following:
     " do some checks and write status codes
   if status eq 'e'.
     call function 'POPUP_TO_CONFIRM'
        EXPORTING
          text_question  = text-001 "Do you really want to save the erroneous data ?
        IMPORTING
          answer         = w_answer
        EXCEPTIONS
          text_not_found = 1
          others         = 2.
      if sy-subrc <> 0. " Function call failed.
      endif.
      if w_answer ne '1'.
        errorline-MSG_TYPE = 'S'.
        errorline-MSG_VAR1 = 'Addressdata erroneous!'.
        append errorline to CH_T_ERROR_TABLE.
        exit.
      elseif w_answer eq '1'.
        errorline-MSG_TYPE = 'S'.
        errorline-MSG_VAR1 = 'Erroneous addressdata will be saved!'.
        append errorline to CH_T_ERROR_TABLE.
      endif.
   endif.
Could anyone tell me how i can abort the processing of the whole program/transaction and prevent the saving of the data when i'm already within the BAdi and not the Dynpro anymore?
Regards.