management reporter and exchange rates

today's exchange rate is yesterday's closing rate.

for a month end we will also enter today's closing rate for today's rate so that month end revaluations will use the month end rate.

so we have two rates for each month end.

management reporter multicurrency feature is now translating my CAD entries into USD for me and it can see both rates and is therefore pulling all the transactions twice.

Is this a bug in MR?  Is this a set up issue in MR or GP? Is this an expectation that the data should / can only have one rate per day?

thanks!

Ian