Should a rate adjustment be made for translated expense balances?

Hello,

We have recently started adding new sets of books in different currencies.  When we translate the balances for consolidation, a rate adjustment is made only for balance sheet accounts and not P&L.  As a result, in the originating set of books, an expense account had a balance in one month and was eventually brought to zero.  Since they weren't in the same periods, the rates used for translation were different, resulting in a balance in the consolidated company but not the original.  How should we handle this?  I'm wondering if we missed a setup step.

Thank you in advance for any help you can offer.