Duplicate data records in write optimized DSO

Hi all,

I am loading 2LIS_02_ITM (Purchasing Document - Item Level) data to a write optimized DSO. I am still checking uniqueness of data. I am getting duplicate data record errors; however, the records don't appear to be duplicates because the difference is that the Reversal Indicator is checked (X) on some of the records that are failing. Why isn't this recognized?

Any suggestions for eliminating these errors with a write optimized DSO? What are the implications of checking the "do not check for uniqueness" option? I am afraid I will lose records - I need all invoice & goods receipt relevant records to be maintained.

Thanks

C