Doctrine 2 anotations : one to one bidirectional cross dependance

Hello,

as far as i can see in Doctrine doc , and specially the one-to-one bidirectional association example (http://doctrine-orm.readthedocs.org/en/latest/reference/association-mapping.html#one-to-one-bidirectional), the 2 lines I deleted are not needed. In my case, it was generating cross foreign keys in database.