CMR 1:M with compound keys?

Pardon a possible repost, my original post disappeared.
I've got two tables with compound PKs. Does OC4J 9.0.3 support CMR for CMP beans with compound keys?
Thanks!

April,
I built a simple CMR Employee -> TimeCards (empno, timecardno as composite PK)
Here is the orion-ejb-jar.xml that demonstrates the ampping:
<?xml version = '1.0' encoding = 'windows-1252'?>
<!DOCTYPE orion-ejb-jar PUBLIC "-//Evermind//DTD Enterprise JavaBeans 1.1 runtime//EN" "http://xmlns.oracle.com/ias/dtds/orion-ejb-jar.dtd">
<orion-ejb-jar>
<enterprise-beans>
<entity-deployment name="Employee" data-source="jdbc/OracleDS" table="EMP">
<primkey-mapping>
<cmp-field-mapping name="empno" persistence-name="EMPNO" persistence-type="NUMBER(4)"/>
</primkey-mapping>
<cmp-field-mapping name="empno" persistence-name="EMPNO" persistence-type="NUMBER(4)"/>
<cmp-field-mapping name="ename" persistence-name="ENAME" persistence-type="VARCHAR2(10)"/>
<cmp-field-mapping name="job" persistence-name="JOB" persistence-type="VARCHAR2(9)"/>
<cmp-field-mapping name="mgr" persistence-name="MGR" persistence-type="NUMBER(4)"/>
<cmp-field-mapping name="hiredate" persistence-name="HIREDATE" persistence-type="DATE"/>
<cmp-field-mapping name="sal" persistence-name="SAL" persistence-type="NUMBER(7,2)"/>
<cmp-field-mapping name="comm" persistence-name="COMM" persistence-type="NUMBER(7,2)"/>
<cmp-field-mapping name="deptno" persistence-name="DEPTNO" persistence-type="NUMBER(2)"/>
<cmp-field-mapping name="timecard_empno">
<collection-mapping table="TIMECARDS">
<primkey-mapping>
<cmp-field-mapping>
<entity-ref home="Employee">
<cmp-field-mapping persistence-name="EMPNO" persistence-type="NUMBER(4)"/>
</entity-ref>
</cmp-field-mapping>
</primkey-mapping>
<value-mapping type="debu.cmr3.TimecardLocal">
<cmp-field-mapping>
<entity-ref home="Timecard">
<cmp-field-mapping>
<fields>
<cmp-field-mapping name="empno" persistence-name="EMPNO" persistence-type="NUMBER(4)"/>
<cmp-field-mapping name="timecardno" persistence-name="TIMECARDNO" persistence-type="NUMBER(10)"/>
</fields>
</cmp-field-mapping>
</entity-ref>
</cmp-field-mapping>
</value-mapping>
</collection-mapping>
</cmp-field-mapping>
</entity-deployment>
<entity-deployment name="Timecard" data-source="jdbc/OracleDS" table="TIMECARDS">
<primkey-mapping>
<cmp-field-mapping>
<fields>
<cmp-field-mapping name="empno" persistence-name="EMPNO" persistence-type="NUMBER(4)"/>
<cmp-field-mapping name="timecardno" persistence-name="TIMECARDNO" persistence-type="NUMBER(10)"/>
</fields>
</cmp-field-mapping>
</primkey-mapping>
<cmp-field-mapping name="timecardno" persistence-name="TIMECARDNO" persistence-type="NUMBER(10)"/>
<cmp-field-mapping name="workhours" persistence-name="WORKHOURS" persistence-type="NUMBER(4,2)"/>
<cmp-field-mapping name="timecarddate" persistence-name="TIMECARDDATE" persistence-type="DATE"/>
<cmp-field-mapping name="employee_empno">
<entity-ref home="Employee">
<cmp-field-mapping persistence-name="EMPNO" persistence-type="NUMBER(4)"/>
</entity-ref>
</cmp-field-mapping>
</entity-deployment>
</enterprise-beans>
<assembly-descriptor>
<default-method-access>
<security-role-mapping impliesAll="true" name="<default-ejb-caller-role>"/>
</default-method-access>
</assembly-descriptor>
</orion-ejb-jar>

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EntityManagerFactory emf=Persistence.createEntityManagerFactory("tryPU");
EntityManager em = emf.createEntityManager();
Categoria c = new Categoria("prova");
Sottocategoria s = new Sottocategoria(c,"riprova");
em.getTransaction().begin();
em.persist(c);
em.persist(s);
em.getTransaction().commit();
em.close();If, instead of Categoria entity as part of the compound class, I put
String nomeCategoria;all is fine.
I wasn't able to figure out why... or where's the error.
Any suggestion on how to proceed?
My provvisional solution then is to use simple keys by putting an extra field as key of the entity (Sottocategoria in this case). Is that fine?
Thanks for the answers!
Edited by: muganz on Feb 25, 2010 10:37 PM

The JPA specification does not allow the use of Entities as PKs. In the specification the PKs must be primitive values or PK classes derived from related entites.
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