Rounding Issue with Translation Within Ledger (FSPCCURR)?

We have a business unit with base currency of JPY.  In the Ledger Group, LOCAL ledger is JPY and ACTUALS ledger is USD.  ACTUALS is the translation ledger, so the results of FSPCCURR process hit the ACTUALS ledger in USD.  We have an Income Statement step that evaluates all Income Statement accounts for the respective period (Time Span = PER).  For a given set of chartfields, there is only one journal during the period.  It used the appropriate market rate.  Therefore, the FSPCCURR process should not make an adjustment to this set of chartfields.  The USD balance agrees to JPY