Hi there,
as you can see on the attached pictures, there are some assignment problems if you change a device between different networks ...
I had the device at the end in the 10.10.100.x network (last entry) and where unable to assign it directly via the button "Neue Zuordnung" because there where no "MAC-Adress" assigned. I had to enter it manually.
Maybe a bug, maybe only cosmetic?
Robert