I don't think that validating the Fixed Asset calendar is in the Year End checklist for Dynamics GP, but it should be. I've talked about the Fixed Asset calendar before and why it's important to make sure that it matches your fiscal calendar. At year end, you want to make sure that you've created the Fixed Asset calendar for the new year. Otherwise your January depreciation run will fail with a date related error.
So when you ensure that you have your 2007 calendar created and correct before closing 2006, take a look at your FA calendar as well. The FA calendar is set by quarters and is located at Tools->Setup->Fixed Assets->Quarter.
You also need to make sure that the current fiscal year is correct in the FA books. Tools->Setup->Fixed Assets->Book.
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