Retirement tax questions

Thank you for taking the time to reply. Good to know that amended returns are free in most cases. But I think the bigger point is getting missed here - how is it possible for Turbo Tax to miss the discrepancy in the amount of IRA deduction between my federal and my state return? Why aren’t there better safeguards against this type of mistake? I would like a big, animated or highlighted note stating “please delete your in-progress state return if you go back and make any changes to your in-progress federal return”!!

Since this discrepancy affects my NY state taxable income and in turns affects my NJ return (because I work in NY but live in NJ) I have to file amended returns for both states. It is a terrible waste of time that can be prevented by Turbo Tax giving more notice to clients during the filing process. 
I hope that someone is listening!

Thanks!