you need to tag the persistent fields that will be part of the PK :

  | /**
  |  * ...
  |  * @ejb.pk
  |  *    extends="java.lang.Object"
  |  * ...
  |  */
  | public class MyEJB ...
  | 
  | ...
  | 
  |    /**
  |     * @ejb.interface-method
  |     * @ejb.persistence
  |     *    column-name="topic_id"
  |     * @ejb.pk-field
  |     */
  |    public abstract Integer getTopicId();
  | 
  |    /**
  |     * @ejb.interface-method
  |     * @ejb.persistence
  |     *    column-name="user_id"
  |     * @ejb.pk-field
  |     */
  |    public abstract Integer getUserId();
  | 
  | ...
  | 
  | }
  | 
  | 

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