I'm sitting on the edge of my seat along with everyone else here wondering what that error message says.

Requires CA return be attached.  It was specified in Fed to attach, and shows in NM that it will be.

If you manually attach CA as a pdf, does the problem go away?

In the Electronic PDF Attachments section, it shows

"PDF's that you have selected to attach to your state eFile return are listed below."

The PDF for the CA return is listed.

BTW, I'm using ProSeries Basic

But if you are getting an error message did you try printing the CA to a pdf and then manually attach it as an other state return to see if the message clears?

I fixed it.

I had added it as other, rather than OS (other state)

Thank you

Glad you got it figured out.

I hope you are not trying to deduct taxes paid by another state on the NM return.............