Originally Posted by
DaveReidUK
The phrase "deviation command altitude" sounds like a reference to Selected Altitude - a parameter that is increasingly available to ATC in many (most?) parts of the world via Mode S/EHS, intended to allow controllers to pick up discrepancies between selected FL and cleared FL.
I think this is just a translation issue, commanded should be understood as cleared. In China (and ex-USSR, etc.) ATC "commands" a/c to do this or that.