11i functionality limitation or set up issue?

Hello GL Gurus,

I have a functional set of book where the functional currency is Peso. On this  SOB, we also transact  in  US Dollar. When I run the trial balance on the Peso SOB, it automatically add the peso equivalent of the dollar transactions we made which is good. As a result, our trial balance in Peso is complete and accurate.

Here's the issue, every month we copied over  our transactions to RSOB or reporting set of books in USD. When I ran the trial balance  it ONLY incorporate the dollar equivalent of the peso transaction. It does not add the transactions that we originally entered in US Dollar   that makes our trial balance understated.   Is this a functionality limitation or set up issue?