[hibernate-dev] many-to-one association no persists

Hello, I am having a problem to insert or update the Exam object, as follow: Exam.hbm.xml [code] <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" <hibernate-mapping> <!-- Created by the Middlegen Hibernate plugin 2.2 <a href="http://boss.bekk.no/boss/middlegen/" target="_blank" rel="nofollow">http://boss.bekk.no/boss/middlegen/</a> <a href="http://www.hibernate.org/" target="_blank" rel="nofollow">http://www.hibernate.org/</a> --> <class name="Exam" table="exam" <composite-id name="comp_id" class="ExamPK"> <key-property name="cdUnit" column="cd_unit" type="java.lang.Integer" length="4" /> <key-property name="cdExam" column="cd_exam" type="java.lang.Integer" length="4" /> </composite-id> <many-to-one name="pacient" class="Pacient" not-null="true" update="false" insert="false" <column name="cd_pacient" /> <column name="cd_unit" /> </many-to-one> </class> </hibernate-mapping> [/code] The problem is that the association with pacient is not pesisting in the database, due to update="false" insert="false" configuration. But without this configuration, occour a mapping error: org.hibernate.MappingException: Repeated column in mapping for entity: Exam column: cd_unit (should be mapped with insert="false" update="false"). The exam table have as PK (cd_exam and cd_unit) e the pacient table PK (cd_pacient and cd_unit). But I need to persist the reference to pacient when I am insert or update the exam objet in the database. Please could anyone help me? Thanks, Rufino.