It means Schedule SB, Form 1 - Subtractions from income has not yet been finalized for e-filing. The form should be available on 02/12/2021.
TurboTax now has to program that form into its software. It will be ready by the date IRS starts accepting E-file returns.
Once the form is available you will be able to finish and e-file your return.
Wisconsin Individual Form Availability
Your federal income may include items that aren’t taxable for Wisconsin, or it may not include items that are deductible for Wisconsin. You may have to subtract these items from your federal income to arrive at the correct Wisconsin income. Schedule SB must be filed by persons for whom the subtraction modifications described below apply
[edited 2/1/21 | 6:00 pst]
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