The following are common BizSystemFlag errors encountered with loading a PPS model from the StagingDB:
921- Duplicate Label found across New Row(200) and Existing Row(100)
922- Duplicate Label found within New Row(200)
926- MemberId must be NULL for New Row(200)
927- Label and Name must not have NULL values for New or Update Rows
930- Invalid Foreign Key
This and more detailed error codes can be found on TechNet at:http://technet.microsoft.com/en-us/library/bb660612.aspx