I keep seeing in PS articles and posts that a CO amended 104X can be e-filed through PS software. CO appears in the state e-file drop down box on the Information Worksheet.

However, every time I have tried to e-file a CO 104X, I get a message that says it isn't eligible for e-filing and to paper file.

For 1120S and 1065, CO is grayed out under the e-file amended column. So, it appears that CO S Corp and Partnership tax returns can't be e-filed. 

How do I e-file an amended CO 104X without getting the can't e-file message?

Thank you.