While having full permission to edit the objects of my friends, I am unable make any changes to friend owned objects if they are on a neighboring sim.
Teleporting to the same region as the object does not resolve this. Upon returning to my original sim, I will then be unable to edit objects owned by friends at all.
Changing my active group to be the same as that of the objects, works to allow me to edit said objects on the original sim sometimes, but I remain unable to edit objects on the adjoining sim while across the region line, or right next to it to the object.