ejb 3.1 specs page 367 says
•If the client request is associated with a transaction T1, and the instance is not associated with a transaction, the container suspends the client’s transaction association and invokes the method with an unspecified transaction context. The container resumes the client’s transaction association (T1) when the method (together with any associated interceptor methods) completes. This case can never happen for a message-driven bean or for the invocation of a web service endpoint method of a session bean.
coulndt understood why it CANNOT happen for MDB ?