Donar Advised Fund, Turbo Tax asking for tax basis

I am using Turbo Tax Premier and I am stumped at entry for charitable contributions for a Donar Advised Fund.   

If giving appreciated stock directly to the charity you do not need a tax basis.    TT is asking for one on the form.

If giving appreciated stock directly to the charity you do not need the basis, so what should one enter .    Do you have to give them a number for the basis.   

Thanx,

Dave H.