I accidentally e-filed a NYS Partnership full return rather than just the NYS fling fee form. To my surprise, the return was accepted even though there are 20 errors on it.

How could it have possibly been accepted? I've been using Pro Series since 2006. Usually if there is one error, it isn't accepted.  I have never had this happen before

I did e-file the NYS filing fee separately.  But, now does that mean I have to file an original federal return, but an amended NYS return.  Since e-file already accepted the NYS return.  

I don't think mailing the NYS return in would make sense, since NYS would already think a return was e-filed