Where is the SAP logic to process the BDCDATA?

Question

Hi, expert.
Where is the SAP logic to process the BDCDATA that we passed on CALL TRANSACTION 'VA01' using bdcdata mode.....?
On the other words, can I see the SAP logic to understand how SAP process 'CALL TRANSACTION' statement?
Thanks.

Answer 1

Martin,
thanks for the reply.
I understand 'CALL TRANSACTION' works, SAP propagates the value to VA01 screen based on the records we built on the BDCDATA internal table.  
For example, we are going to create order with 5 line items.  However, the 1st line itme is okey, but 2nd line itme we hit a material error, so BDC stopped.  We have requirement that want to remove 2nd line item and want BDC continue to process for 3rd, 4th, 5th line items.   User can run CALL TRANSACTION with mode 'E'.  So BDC will stop when hit error.  at this point user can delete item use SAP 'delete' icon.   But the problem is BDC still have leftover records for 2nd item.   I hope there is way to locate BDCrecords and in the userexit to remove the leftover BDC records for 2nd item.  Then BDC can continue to process 3rd item....   That is why I try to find how SAP logic behind 'CALL TRANSACTION' and hoping to locate where is the SAP logic that process BDCDATA record one by one....  hence I can think about how to cleanup/delete leftover BDC records for 2nd line item.
I put breakpoint at 'CALL TRANSACTION' statement and then click 'single step'.  But next step, it immediately stop in the VA01 main program 'SAPMV45A' module transaktion_init.  I was hopping the next step will stop in the SAP program that I can see it handles/loops BDCDATA...  But not.