The 00 works for non-resident and part-year returns.
If your son lived in IN part of the year, joined the military and changed his home of record, then a part year return would be correct for the income earned before changing his HOR.
According to the IN state website regarding military, if your Home of Record is IN, your income is taxable.
If you have no IN income, then you do not need to file an IN return. If non-resident with no income, don't file.
If you are unable to get the part-year to work correctly, use the following link for a customer support number.
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