Hi,
You have to go to PSA-->mange-->select the request-->PSA maintenance-->Select all data packages-->Select erroneous records-->Keep the value which can account for all data packages(summation) in Number of values
Correct the records and save them in PSA. Come to your Standard DSo and delete the req-->Delete from wrote optimized dso also. Finally update the same request from PSA till standard DSO.
If your data flow is 7.0, then use this http://scn.sap.com/docs/DOC-12154
Regards,
Suman