Can you make changes to a Qantas RTW redemption once you have taken your first flight?

Hi Points Hack, are you able help me? I am currently traveling on a Reward RTW in business class, I just tried to change the routing of my fare, which I have already complete 50% of the segments and the next departs on the 10/11. But the qantas agent just told me route changes as not permitted. The agent went to confirm the ticket to only tell me that only time and date changes can be made, I can’t change the route… which is devastating… is this your understanding?

That sounds right to me.  I am pretty sure I’ve read somewhere that you can’t change the route once you’ve started travelling.