I'm getting the exact same error. I have the most recent version. The 2.0 final version. My sequence is to instantiate side b, instantiate side a, add b to a's list, then add a to b's list. I then attempt to persist side a and I get the exception "Detected attempt to establish This(2) as the parent of That(1) but the entity identified by That(1) has already been persisted without a parent. A parent cannot be established or changed once an object has been persisted."
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