Yeah well I'd like to know how this makes any sense.
While security screening is in process at a certain aerodrome in W.A., I am allowed to use the gate code to go to my GA aeroplane and load my luggage into it. I can also pre-flight it and do anything else that may need doing. However, before I depart, I must go BACK through the gate and proceed through security screening, having left ANYTHING I want IN the aircraft!