What is the new BO implementation for CustShipImpl.InvoiceShipment?

We are preparing to upgrade from ERP10 to Kinetic and have an application that uses the business objects to interact with the ERP. Updating the BO DLLs to the new Kinetic versions was pretty straight forward with only a handful of tweaks required for the BO method calls we make except for one.

In the CustShipImpl object, we call the InvoiceShipment method which was available in ERP 10. With the new Kinetic DLLs, this method no longer exists. Does anyone know what happened to this functionality and how/if it is mapped in the new DLLs?