Hi Ravindra
We had a similar problem. If I'm right you have two possibilities to do this. The first way is, you have in the source system a timestamp that you can use in the InfoPackage for selection of the new/modified data.
If the other case you can maybe use an ODS object instead. There you can define if data is new or for update. The BW creates then automatically a delta mechanism for loading the data into data targets (see Online-Docu http://help.sap.com/saphelp_bw30b/helpdata/en/f9/45503c242b4a67e10000000a114084/frameset.htm)
Hope this helps.
Regards,
Hansjörg
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