The situation you describe does not sound normal in my experience.
When you have worked for the same company and you have received one W-2 with multiple states being reported on that W-2, the only lines or boxes that should be different would be the ones associated specifically with state information. That would be boxes 15 through 17 and maybe 18 through 20 if locality information is reported.
Box 12 should not be broken down by each state. Therefore, there should not be duplicate information in box 12. That is the reason for the error message you are seeing. You have only entered information as it was given to you.
Take a look at your W-2 again and see if there is a Federal copy of the W-2 that shows only one of each entry in box 12. It may be reporting a combined total from the states. If so, use that information to fill in box 12 in TurboTax.
If there is not a combined total for the box 12 codes, add each one together and report a combined total instead of entering one for each state. The information reported under codes C, AA, and DD is informational and does not affect your tax return directly.
@hellotax1111
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