Hello,
I did some further testing with my RU7 SEPM and my limited administrator was able to edit the Multiple GUP list.
It appears we made some changes to what permissions limited admins had over this list between RU5 and RU6 MP3 and then, in RU7, changed it back.
I've seen these permissions change in other areas on the software once or twice, so I suspect that's what happened here.
Regards,
James