Expense Amortization (Amortization Voucher) - Scanned Invoice

We're interested in using the Expense Amortization functionality.  We've configured it in our environment and it's working online.  However, when reviewing the "To-Be" business process, we're trying to determine how to create the Amortization voucher style from a scanned invoice (from the voucher staging tables).  In reviewing the voucher build process application engine code, it does not include Amortization (AMR) voucher style. 

Are there any companies using this functionality?  If so, how are you managing your prepaid invoices amongst the thousands of invoices that you receive?

Oracle... what is the use case for this functionality?