The agency that we report to now kicks back a report of those that we reported that in some way don't conform to the appropriate standard. Our core also runs a test of the data prior to submission and gives us a list of those that don't conform to the appropriate standard.
Sometimes, the file error is something like the a coding error like 1 person as sole responsibility and 1 person as joint responsibility. Or, the loan is showing a code that the loan was paid from proceeds of collateral, but also still showing a balance on it. Sometimes, its that there has been no activity in over 7 years and it is still marked to report on our system (thus, still reporting).
I'd see what kind of reports to which you have access.