I am also getting the same error - A cycle is detected in the object graph. This will cause infinitely deep XML whenever there is a circular reference.
I followed Sahoo's advice by making object reference to null. Now I am getting an exception - Cannot update the record.
Looks like when i am making the object reference null it is synchronizing the inmemory object with database and hence it is updating the database and kicks out with exception - cannot update - value cannot be null.
How can i prevent it from updating the database or rather stop synchronizing the inmemory object with datasbe for this.
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