Hi there, 

So the 3903 is an interesting case for CA. The Federal does not allow the 3903 except in the case of being a military move — CA allows it otherwise.  The problem is that CA requires the federal return be included and pass validation. But, federal validation will fail if the 3903 is there without the "Armed forces move due to permanent change of station". So even if you send CA only, it will fail validation because of the required copy of the federal failing validation because that field isn't marked. That's why the diagnostic states you have to paper file.

Hope this helps clear it up.

-Betty Jo