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 Orders Engine in CompassAE implements models for Orders, Order Items and Order status tracking. It also houses models for charge lines associated with Orders (although it could be argued that this functionality should reside in Commerce).

The Rules Module of CompassAE includes classes which act as helpers in externalizing the execution context of CompassAE value objects for processing by a rules engine. It also includes an integration with Ruleby, which is a pure ruby implementation of the forward chaining Rete algorithm.