I filed my 2018 NJ state return on time and was due a refund. The state recently refunded a lesser amount and sent an explanation that this was due to a Retirement Income Exclusion being denied. I realized that I had answered a certain question incorrectly in TurboTax and, when answered correctly, TurboTax showed the adjusted refund as the reduced amount the state had already sent to me. Two questions: do I need to file an amended NJ state return to correct my error; and how do I get TurboTax to not say I owe the state the difference between the originally-claimed amount and what the state eventually sent to me as a refund, that is, to have the amended return net out to a zero tax liability or refund since the state already has kept the difference?