I'm trying to find exam procedure guidance that lists an acceptable error rate/threshold for CRA data integrity, similar to what is published in the OCC HMDA exam procedures (I.e. 5% in any one field or 10% of the total sampled records). Does anyone have any suggestions?

A little old, but probably the best you are going to find:

https://www.federalreserve.gov/boarddocs/supmanual/cch/200706/cra_sg.pdf

Thank you!