Hi!

Sometimes i meet some exceptions on use of @In and @Out, because i don't know exact meaning of those and attributes.
The common exception is:
   *javax.ejb.EJBTransactionRolledbackException: could not set field value: XXX.service*
I declared like this:

        @Stateless
        @Entity("service")
        public Class Service {
        .....................
        }

        @Stateless
        @Entity("XXX")
        public Class XXX {
          @In(create=true)
          private Service service;
        }

What is the problem in this code?
And maybe, you can explain me the difference between @In and @Out including their attributes such as "create", "required".

Thanks for you help!!!