I know there are tolerances that would require re-submission.
Is there a percentage of errors at which point an examiner can say, "we're not going further with this. We will not consider the loans as there are too many errors in the data files. You cannot resubmit either."
This hasn't happened, but we were wondering if there was a specific drop dead percentage.

This was taken from a FDIC PowerPoint Presentation but references HMDA Data and not CRA Data: https://www.fdic.gov/news/conferences/kc_region/2013-08-08-hmda.pdf

"Correction and resubmission may be required if the percent of omissions exceeds 10% for reporters with fewer than 100 entries or if the percent of omissions is greater than or equal to 5% for reporters with 100 or more entries"

Check your regulator's exam manual - it will walk you through the process and errors exactly.