MONTERREY, Mexico & NEW YORK--(BUSINESS WIRE)--Fitch Ratings has updated its rating criteria report for Mexican RMBS that are sponsored by commercial banks and Sofoles/Sofomes. Updates to the criteria includes the revision of assumptions related to the expected base case Frequency of Foreclosure (FoF), reverting back to Fitch's long-run base case FoF because of the stable macroeconomic expectation for the country, as well as the stable trends observed in delinquencies of mortgage portfolios. Th