The attached document details the Contract Earnings logic used on the Contract Earnings report in the Dashboard Reports Earnings folder. 

The document defines the Contract Earnings logic for a Capital (Direct Finance) Lease, Operating Lease, and Loans. 

As noted in the attached document, the GL Interface numbers and Contract Item Types listed in the document should match the values shown on the Contract Explorer > Information > Main G/L Transaction screen (v5.20 and above) and are provided to help reconcile or troubleshoot results