Thanks - it’s actually not so interesting -:
The best place to look is when the binding is restarted since at that time the binding should try to read the value of this command class. During initialisation (DYNAMIC phase) it reads all information from the device and isn’t dependant on the definition of the channels, or items. This is probably the only (or best) place to look to see what’s happening with this.
I note that the manual doesn’t mention the METER class, but since the device says it supports it, I would have expected it to respond…