Thanks for the help so far.

I have now completed all the work for one JOINT California RDP return, and two SINGLE federal returns, with income split according to Community Property rules.

I have e-filed the two federal Single returns and attached Form 8958 to each.

The final hurdle: I want to e-file the Joint California RDP return--but it got rejected, with this message: 

“California Individual: The federal return failed final review. We recommend you fix the errors found in Final Review and reselect the return for conversion. Return conversion failed.”

What do I need to do to e-file the Joint California RDP return?

I of course do NOT want to e-file the federal mock-up MFJ return.  How can I get around this?

Thank you!