1099-R 2a taxable amount equal to total distribution for after tax funded IRA forcing Trubotax to calculate tax when it should be zero?

I am 78 years old and I had an IRA account that was funded with my own after tax cash and all income was not reinvested back into the account.  closed the account and received 1099-R showing the entire amount as taxable.  box 1, 2a showing the same amount, 2b box checked, box 7 code is 7 and IRA SEP box checked.  

how to resolve in Turbotax or otherwise?