My guess is because there isn't a top 100 ETF, it looks like they're joining the top 40 index with the midcap index inside their own wrapper. EE doesn't have the equivalent, so you can't move it directly.
It shouldn't be a problem as long you you never withdraw any cash (apart from transaction fees), get them to move it.
Hey GCR, it's hard coded into the system to automatically block shares under R1. It would take ages to code exceptions in, but they'll reappear as soon as they hit R1.