The CompassAE Financial Accounting Engine implements the basic classes that allow either interface or implementation of general ledger, accounts payable and accounts receivable modules. This module is experimental at this stage.

The Transactions and Accounts Engine implements the root classes for adding business transactions and accounts to parties. The key marker interface classes here are BizTxnEvent, which represents a common interface for all manner of management accounting transactions, and BixTxnAcctRoot, which is the root class for the accounting of transactions. CompassAE uses separate structures for management and financial accounting.