The business basis would be what you entered for the cost of the vehicle times the business use percentage less the accumulated depreciation. Your AMT (alternative minumum tax) depreciation would have to be less than that amount. It looks like your depreciation is $2,719, so subtract that from the cost of the vehicle to get the basis and adjust your AMT depreciation so it is not more than that amount.
As a practical matter, most taxpayers are not subject to an alternative minumum tax, so it is unlikely what you enter for it will affect your income tax. So you could try entering an amount smaller than $2,719 and see if your tax changes. If not, then you're probably OK if that resolves your issue.
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