How to write enhancement logic for AR datasource

I need to enhance the AR data source(0FI_AR_4) with the following logic:
LOGIC:
First find out the KB Partner function in the field: KNVP-PARVW. Once the KB value is obtained, then display the value from KNVP-PERNR
Thanks..
Edited by: Jim kim on Jul 25, 2011 10:41 PM
Moderator message : Spec dumping not allowed. Thread locked.
Edited by: Vinod Kumar on Jul 26, 2011 10:18 AM

Hi Ram,
Generally the IDoc user exit is called at the following places:
1) When the control record is read.
2) After each and every segment in the data record
3) At the end of the data segment processing.
The IDoc user exit interface generally imports IDOC_DATA (data record internal table) table. Now the data records in the internal table should appear in the same order as maintained while defining IDoc structure (WE30 transaction). For SAP standard segment SAP code will take care of this. For extended segment you will have to take care of this aspect by appending the Z-segment in the IDOC_DATA table.
You can do this by:
         looping at IDOC_DATA table:
             - Do a case-endcase fo IDOC_DATA-SEGNAM (This stores the segment
               structure as per the hierarchy).
             - Within the case for "Z-segment" you can write the logic for appending
               the Z-segment to IDOC_DATA-SDATA.
Hope this gives some clue.
Regards,
Gajendra.

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