It is how NY calculates nonresident income. On the IT-203, form NY first pretends that all of your income is taxable in NY, and calculates the tax on that amount, and then prorates the tax to the percentage of income actually earned in NY. Your OH income is not taxed in NY, but the way it reads on the NY return may make it appear that it is. However, if you see boxes 45 and 46, you will see the prorate.
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