Deductions & credits

I understand that at the beginning of the charity interview, you can select "items", "money", "stock" or "mileage and travel expenses."  Originally, I selected "stock" but then when I needed to indicate that I inherited the stock instead of purchasing, TT told me to enter the donation as "items".  Once you go through that part of the interview, under item you can select "publicly traded securities".  Any idea WHY the difference between inherited stock and purchased stock, if the end result is the same?  Thanks.