Do not amend the return ... instead contact the taxpayer advocate office instead for assistance. Tell them the error is obvious and how to fix the return and let them fight for you....
If it's been more than 90 days since the return was accepted then you can ask for help from the Tax Payer Advocate office:
At the following IRS website, find the USA map and click on your state, and it will give you the number of your IRS Taxpayer Advocate.
http://www.irs.gov/uac/Contact-a-Local-Taxpayer-Advocate
If you are unsuccessful with the Taxpayer Advocate for your area, you can also try the special IRS phone number for the Taxpayer Advocate Service at 877-777-4778.
More info on the Taxpayer Advocate Service:
http://www.taxpayeradvocate.irs.gov/about/who-we-are
http://www.irs.gov/Advocate/Taxpayer-Advocate-Service-6
Also see this article for more info on how the Taxpayer Advocate Service works:
http://www.irs.gov/taxtopics/tc104.html
