my problem was in fact using the "Version 3.0" instead of "Version 3.2" in the xdoclet configuration. My bad.

Anyways after wrestling with auto-increment and postgresql I will post my source here, because there are far too few examples to be found.

/*
 * Created on 13/05/2004
 */
package com.wt.helpdesk.ejb;

import java.rmi.*;

import javax.ejb.*;

/**
 * @author glang
 *
 * @ejb.bean
 * name = "JobTicket"
 * display-name = "JobTicket"
 * view-type = "local"
 * type = "CMP"
 * cmp-version = "2.x"
 * local-jndi-name = "helpdesk/JobTicket"
 * reentrant = "false"
 * schema = "JobTicket"
 * @ejb.pk
 * class = "java.lang.Object"
 *
 * @jboss.persistence
 * remove-table = "true"
 * table-name = "JobTicket"
 * @jboss.unknown-pk
 * class = "java.lang.Integer"
 * column-name = "ID"
 * jdbc-type = "INTEGER"
 * sql-type = "SERIAL"
 * auto-increment = "true"
 * @jboss.entity-command
 * name = "postgresql-fetch-seq"
 */
public abstract class JobTicket implements EntityBean {
 /**
 * @ejb.create-method
 * @ejb.interface-method
 */
 public Object ejbCreate(String summary) throws CreateException {
 setSummary(summary);
 return null;
 }

 /**
 * @ejb.persistence
 * column-name = "SUMMARY"
 * jdbc-type = "VARCHAR"
 * sql-type = "varchar(50)"
 * @ejb.interface-method
 */
 public abstract String getSummary();
 /**
 * @ejb.interface-method
 */
 public abstract void setSummary(String desc);

 public void ejbActivate() throws EJBException, RemoteException {}
 public void ejbLoad() throws EJBException, RemoteException {}
 public void ejbPassivate() throws EJBException, RemoteException {}
 public void ejbRemove()
 throws RemoveException, EJBException, RemoteException {}
 public void ejbStore() throws EJBException, RemoteException {}
 public void setEntityContext(EntityContext arg0)
 throws EJBException, RemoteException {}
 public void unsetEntityContext() throws EJBException, RemoteException {}
}