Hi John,
When you wish to post to a prior fiscal year, you do not have to edit the fiscal calendar. Simply select the appropriate fiscal period (even though it is the current year, not last year) in the journal entry batch. Then when you use the Post to Prior Year function, the fiscal period is automatically re-allocated to the same period last year.
This may seem awkward, but there is no 'prior year' batch system to differentiate current year and prior year batches - there is only one batch system to enter all possible batches. It's in the posting that makes the difference.
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Regards,
Softrak Tech Support