I seem to remember there was some weird interaction between bonus depreciation and auto limits but I've googled different things and can't seem to find anything at all now.  @TaxGuyBill is the rock star on these things.  From my (less reliable every day) memory, I researched it a few years ago and concluded that $0 was somehow "correct" at the time with depreciation resuming in year 7.  If you look at the future depreciation (I think ProSeries has a button hiding somewhere on the Asset Info Wks) does it show depreciation resuming next year?

Rick