Hi Susan,
If you are 100% sure that all of the Year End adjusting entries have been posted to FY2008 (using Steve's example), then it is OK. The Post to Prior Year function is disabled when a Next Year exists.
Once you create the Next Year, you cannot reverse it (short of restoring data from a backup). I recommend doing a data backup before creating the next year.
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Regards,
Softrak Tech Support