Roof replaced on a commercial building.  I believe this qualifies for 179 expense, with a depreciation method of 87.  When this combination is input to Lacerte, the above diagnostic appears as Critical Diagnostic Warning.   

Questions: 

1. Are commercial roofs not eligible for 179 expense?

2. Is the proper depreciation method not 87?

Appreciate any help.

Solution: Use method 67 (15-year SL Improvements) for a roof. This will allow you section 179 expense for the property and the diagnostic should be resolved.