Hopefully someone can help me with an amended return. I followed all the instructions but when I try to submit I get the following error 

Duplicate return. The SSN/EIN for the selected return is identical to that of another return in your Elec Filing Home Base view which has been e-filed. Please open return modify the SSN/EIN so that is unique. The original has already been e-filed. Someone in the community suggested unchecking the efiling boxes for the Federal and State in the original. I tried that too but didn't have any luck.

Thanks

Duncan1