Partner's Autopost program will post ERA items that match charges in Partner. If an item can not be posted, it will appear on the Manual Report. (From there, you can review them, post them in pip, or take other appropriate actions.)
What are the specific reasons that something on an ERA will not autopost?
Charges Do Not Match: Partner checks each charge described on an ERA and makes sure it matches an identical charge in Partner. In order to match, the charges must have the same: