When the figure scanning came in, part of the agreement was that the scanning rate would be around 500 items per hour. There would be coaching and counselling for someone if they were not achieving this scanning rate.
There is still no agreement nationally on what you are supposed to perform per hour. Tracked do certainly not have any agreement nationally about what is acceptable.
I would be asking your local rep and your area rep if they have agreed a rate with management locally, If they have then you need to be asking your reps why because it has not been agreed by the cwu at Hq.
Management cannot use conduct anyway as a first port of call. It always has to be coaching first and there are always variables with the ACF and a decent rep must argue this .