Hibernate version: 2.1

Mapping documents:

Code between sessionFactory.openSession() and session.close():

Full stack trace of any exception that occurs:

Name and version of the database you are using:

Debug level Hibernate log excerpt:

Is it possible to exclude certain fields when using @hibernate.collection-composite-element?
I am getting this error:
Exception in thread "main" net.sf.hibernate.MappingException: Repeated column in mapping for collection:

and this is because the key column is a field in the class specified for collection-composite-element.