After you file

I was just checking to see with how little he made and his paying for college if it made sense to file his return v keeping him on mine.  The result was keeping him on mine, but I accidentally filed his instead of mine.  Then I went and filed mine without removing his SSN and was rejected. 

So the rejected eFile is 100% rejected based on your answer, but I hadn't printed that out.  When I went back into TurboTax, the amount owed was only the additional $500, and now I don't have the original return to send. 

Can I just start from scratch without him on the return, or will the IRS expect an amended return?