I did what you said by saving the originally e-filed and accepted return into a different name and unchecked e-file.  I then use the originally filed name to work on my amended return.

What's different between client name & file name?  At this time, the client name for both files are the same.  However, the filenames are different.  

I am also puzzling why I was able to select the amended return for e-file the first time.  My first e-file attempt failed because taxpayer's signature date was still stayed at last year.  After I corrected the date and try to re-submit, the amended file became "not ready" due to "federal return not completed". 

Thank you, Lisa.  Really appreciate your help!