It is certainly less common to have only state taxes withheld without also having Federal taxes withheld. If your form only shows one number for tax withholding, it is a reasonable assumption that it is for Federal taxes. Therefore you can leave box 11 empty, along with boxes 10a and 10b on the input screen.
If you have a payment record or check stub available you may be able to verify that the withholding was for Federal taxes and not state.
@cipher991
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