[hibernate-dev] one-to-one mapping

hi im trying to create a simple one-to-one mapping in my hbm files. For Example: <one-to-one name="account" class="kbusy.database.model.Account" /> is in the Tutor.hbm.xml My many to one, one to many and many to many mappings all work, but one to one doesnt. i would expect him to create me an account id column in my tutor table, but he does not. what am i doing wrond? greez