This year we have seen a number of states issue 1099-G forms that have tax withheld in box 11, but boxes 10a and/or 10b are empty. TurboTax requires that if box 11 has a value, then boxes 10a and 10b must also have entries.
Box 10a is probably the two-letter state code for your state (example: "MI" for Michigan). The filer identification number for box 10b is likely to be the same to the Payer’s TIN on the left side of the form.