Problem in using the PA characteristic derivation using KEDR transaction

Hi All,
              For one of my requirements i need to update the 'KAUFN'  field in CE1XXX table with the reference document no(Contract number- VGBEL) which is there in VBAK table while createing the sales order using VA01 transaction.  I have implemented one derivation using the user exit EXIT_SAPLKEDRCOPA_001. I got succeeded in updating the structure I_COPA_ITEM with the VGBEL filed, but the problem it is not updating in the table CE1XXX table. 
            Please suggest me regarding this problem. Is there any other way for this issue.

Hi Hussain,
Have a look at the following useful link:
Re: CO- PA characteristic derivation
Hope it helps.

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