Get your taxes done using TurboTax

Yes, installment sale is what you need rather than the seller financed to get to sch B. In looking at the sanitized return, you entered the interest income on the screen, Enter Seller-Financed Interest You Received, which you shouldn't have done. The note on that screen says to enter it in the installment sales section. If you add the interest in the Installment Sales section, there's no error and no need for the SSN.