Unearned/Unbilled Revenue using Project Billing

Is there a way in project billing to change the revenue accounting when you back date revenue?  Often during our month end close we will need to back date the revenue to a prior period and sometimes between that time we may actually release the invoice.  When we back date to a prior period the accounting alway reflects unearned revenue, when at that time it should have been unbilled revenue.

Anyone have a solution for this?

Invoice 200005708Invoice generated: 7/2/12, but in the JULY periodReceivableXXUnearned RevenueXXRevenue Transaction:Revenue generate: 7/5/12, but back-dated to 6/30/12 GL dateUnearned Revenue