Ok. I am in the same situation. Just in my case it is saying "the date what you entered should not be after 12/01/2019" after I pressed "transmit your returns"
Does it mean I should delete IT-201X from my amended 2018 and send it my mail? Or I should mail all my NYS 2018 amended return? Could you give more detailed information? Because it is saying "you can e-file NYS amended" but because you have IT-201X in it you can't...
