Substitute in Line Item Test (BSEG-GSBER)

Question

Dear all,
I have some questions here. For example, in tcode MIRO, we entered the required information. When click on simulate, there will be another line item for Tax Input lines.
One of my requirement is, PICK the Business Area field (GSBER) data for the Vendor line item and update in the Taxes lines with this data in GSBER field, I would like to copy the Vendor line item text (BSEG-GSBER) to the TAX INPUT(BSEG-GSBER), means different line item.
I will copy the value of the field BSEG-GSBER on the condition WHERE BSEG-KOART = 'K'.
Now i got the business area  but my QUESTION is HOW to paste this business area on the line items based on the condition WHERE BSEG-BUZID = 'T' in the structure i.e. before saving the table BSEG.
When i click save for park documents, the tax input text needs to be saved too. So when i view in tcode FB03, the Tax input text will also have the same value as the vendor line item text. As well as after i post the documents, the Tax Input text should also be there.
The main point is, the vendor line item and the Tax input line item are different. I want to copy vendor line item business area into tax input line business area i.e. different line item text into different line item text.
Can anyone guide me into this?
Thanks a lot. Appreciate it!

Answer 1

Hello Sir,
             As you said I changed EXIT-PARAM to C_EXIT_PARAM_CLASS, but after changing this debugger is not triggering. When I'm using CLASS  my EXIT name is not coming in GGB1. Please suggest me where I've to make changes.
Below is my code....
   exits-name  = 'U197'.
   exits-param = c_exit_param_class.
   exits-title = 'Enhancement For Business Area In Miro'.
   append exits.
form u197 using bool_data type gb002_015
           changing b_result.
   lt_data-bseg[] = bool_data-bseg[].
   read table lt_data-bseg[] into ls_bseg with key koart = 'K'.
      if sy-subrc eq 0.
       v_gsber = ls_bseg-gsber.
     endif.
if sy-tcode = 'MIRO'.
loop at lt_data-bseg[] into ls_bseg where koart ne 'K'.
       if ls_bseg-gsber = v_gsber.
       else.
         b_result = b_false.
       endif.
endloop.
       clear ls_bseg.
endif.
Thanks in Advance.
Regards,
Hardik B