Modify fields in Append Structure

Question

Hi there,
I am driving crazy about append structures. We appended a few fields to KNA1 - e.g. a field that keeps a version number (every time a record changes we want to increment the version starting with 1 at creation time).
We found a lot of material about how to append structures and actually, it's fairly simple to extend KNA1 with append structures. But HOW can someone update those fields?
We tried user exit EXIT_SAPLVV01_001 and BAdI IF_EX_CUSTOMER_ADD_DATA-SAVE_DATA to populate those fields at commit of customer data. In both scenarios, we don't have CHANGING or EXPORTING parameters. So, we tried to update the table directly, e.g.
method IF_EX_CUSTOMER_ADD_DATA~SAVE_DATA .
DATA: w_kna1 type kna1.
select single *
  from kna1                            " Customer master table
  into w_kna1
  where kunnr = I_KUNNR.
w_kna1-sap_version = w_kna1-sap_version + 10.
update kna1 from w_kna1.
break-point.
endmethod.
Now, when we execute VD02 the program stops at the given break-point and we see the data changed in KNA1. But the record gets updated by the SAP program SAPMF02D (underlying program of VD02), of course as we cannot manipulate the KNA1 record in the internal table of SAPMF02D.
Is there any way to store information into append structures at save time (within the same transaction) without customizing standard programs?
Many thanks for your help

Answer 1

Hi Maic,
Normally for append structures to standard tables, code is written in user exits where it is mandatory to change existing SAP objects (user exits exist are provided by SAP and you need change key).
For additional functionality to the existing flow of transaction, we use BADIs and customer exits (through CMOD).
Your requirement suits the first point above.
Annyways, try using method GET_DATA in badi CUSTOMER_ADD_DATA_CS. This has changing parameter for KNA1.
Ramesh.