Should I report my basis of retirement income as $6000 for the "specify the retirement income of $0 received from (non-deductible IRA contribution)"? otherwise PA taxes

This question comes up on my PA state income taxes regarding back door Roth conversion.  The $6000 contributed to trad-IRA was not deductible (from post-taxed funds), and the $6000 went straight to Roth IRA few days later.  Don't understand why PA is taxing this event.