Confused about Casualty Loss and Depreciable Asset

How do I handle Casualty Losses on items that are on my Depreciation Report?  I've entered the Casualty loss of the A/C Unit in the Casualty Loss section of TurboTax, but how do I get this removed off of the Depreciation Report?  If I enter this in both places, won't it double-book the loss on Form 4797?