I found this on another website.
http://britishexpats.com/forum/immig...escent-769030/ I can't find anything on the present-day INZ website about making statutory declaration that you've never lived in one of your countries of citizenship
https://www.immigration.govt.nz/new-...e-certificates, though they do mention that as a course of action if the country is difficult about providing a certificate. It sounds as though you need to suggest this to the CO. It would be quite understandable that Romania wouldn't give a certificate if your partner's never had an address in that country.