VERIFIED SOLUTION i

Resolving the error 'A mail piece weight is over the limit for this class of mail' using MailStream Plus

Product Affected:  MailStream Plus™
Product Feature: Parameters

 
When attempting to presort a First Class Flat that is over 13 ounces, MailStream Plus™ is giving this error:
    'A mail piece weight is over the limit for this class of mail' 

MailStream Plus is giving this error because in the USPS Domestic Mail Manual (DMM) there is a weight limit for First Class Flats.
Per DMM 203.3.2.1:
3.2.1 Mailpiece Weight 
First-Class Mail must weight 3.5 ounces or less for letters or 13 ounces or less for flats. 

This piece would have to be mailed as a First Class Parcel or changed to USPS Marketing Mail (if allowed).

Anytime this error comes up is because the weight is not allowed as it has been provided to MailStream Plus on a P ATTR parameter.  
UPDATED:  March 15, 2019