No, you did not need to purchase another TurboTax CD/Download since you are using that version for your own.
Occasionally, the IRS does reject a return when the filer has been listed on another tax return. It's not common. Check the entry of date of birth, social security number and the last name (these are the pieces of criteria the IRS is using for validation). I don't doubt you have all the information correct, but look for any spaces that shouldn't be there. If everything is correct and you continue to have the return rejected you should print and mail your son's return.
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