can you reverse prior depreciation

We have at least two assets that were set up to depreciate even though their status was Work in Progress and the category is EQWIP which is configured not to depreciate. The problem was that someone changed the status in the book page to depreciate. We can change this back, what I would like to know is are there any steps to reverse the prior depreciation calculated and if we reverse the accounting entries, does the period have to be opened for the prior fiscal years, or does it create a journal with reversing entries for current period?  We have