Error uploading reports

Hi,

When trying to upload to the UM Appliance one of the reports received from a Service provider, I receive this error.

The upload failed, probably because the records were not valid and unique. ERROR: duplicate key value violates unique constraint "idx4ec41015"

I have 2.2 version appliance and the reports are generated by a 2.1 appliance. I've tryied uploading them and also "migrating" them. The same error happens everytime.

Thanks for your help!

Seb