First post here! I'm hoping to get some insight from the more experienced. I booked an award that I recently changed to be as follows: LAX-SEA-FRA-BCN in UA F and LH F/C. Stopover in BCN for a week, then: BCN-FRA-TLV in LH C/F (Destination). Return: TLV-FRA-DEN-LAX in LH F, UA F. I had dictated to the agent these flights, and she put me on hold to make the change. When she came back, she told me that she had had to get a supervisor to approve the change because it wasn't a legal routing. She mentioned something about it being a Circle Routing. The itinerary is confirmed, so I'm not worried about it, except she told me that I wouldn't be able to change it again. Can someone explain to me what this means? Thanks!