If your son did not receive a Form 1099 then you do not have to report in on Schedule W.
Schedule W is designed to report State of Michigan income tax withholding. Your son's MI tax return was probably held up because the state was not able to match up the withholding listed by your son with documents received from employers and other third parties.
The Schedule W will show all W-2s and 1099s listed on your son's tax return. As long as everything that your son received is listed, then you are fine to submit Schedule W. Do not submit W-2s and 1099s.
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