Great question!  


The short answer- it depends on what import type you are using...





Standard Transaction Import - For this import type you will need to delete the previous files that had errors, and reload the corrected file.


Standard Manager Investment Activity Import - Using this import type you can over-write the existing data and do not have to delete the file with errors.  


For questions about the Awards Import and Custom Imports, please contact support@fundriver.com


Bulk Import - Using this import type you can over-write the existing data and do not have to delete the file with errors.