The disposition instructions for a business vehicle that was totaled say not to report the disposition on the vehicle asset sheet but to report it on the casualty theft form. The TP incurred a gain due to depreciation deductions. 

After completing the business section of the casualty theft form, the full gain is considered long term. I can't find where to indicate the amount of depreciation to be taxed at the ordinary tax rate. 

How do I properly report the gain so that the depreciation portion is taxed correctly?