As with many things in life that don't happen the way I want them to, I have simply accepted the reason - CUZ!
I spent hours to figure this out... ProConnect will generate IT-NRC. Accessing the data entry fields for an Ohio part-year resident's personal interest and dividends is counter-intuitive. Go to State & Local, Income, OH Bus. Inc. Alloc. and Apport. then look in the upper right corner of the resulting data entry screen, where you should see a "Nonbusiness Income" link, that will enable you to enter amounts that will appear on the IT NRC, such as nonbusiness interest and dividend income. The IT-NRC will then be calculated and included in the return.
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