Scheduling Question

I was considering a Swap with the Pot for a spill trip at the end of August. But I'm curious about whether it's pay protected or not. On Day 3 of 4 there was a charter repo leg that now shows CXD. So what will happen? A DH to DTW to finish the trip? A reroute to something different for less credit? If they alter the trip, do I still get the original spill credit for the Sep bid period?