Project Billing - Transaction Source currency is different from Functional Currency

 We ran into a billing situation and wondered if this was Oracle standard functionaly or if there is a work around.

Env:  11.5.10.2 with Project Family Pack L10

Functional currency:  CAD, billing in CAD, project in CAD

Scenario:  AP Invoice hit my project for $25,233.05 USD on 10/22/2010.  The exch rate at the time is 1.0202 which costed at $25,742.76 CAD.  Everything is fine.  This should be a straight pass-through to the client on the AR invoice.

Upon billing on 12/02/2010 [invoice date], the bill amount came out to $25,783.13 [$25,233.05 x 1.0218] for that expenditure WITH 0 MARKUPS.  It's using the exchange rate of 1.0218. 

On my invoice, I have to show the base cost, multiplier, bill amount.  We were expecting to see $25,742.76 x 1.0000 multiplier = $25,742.76.