Tossbag, Dick's question had nothing to do with your "local procedure". He asked about why his FMS didn't stop him clipping a CTA step in when in full auto. He was given the answer.
I see nothing "local" about being cleared for an approach. The fact that you start out OCTA and, because of the way you operate your aeroplane/FMS, you then clip a CTA step, sound like a personal problem.
There is much nashing of teeth about hypotheses here. To go anywhere with this, we need to know exactly what ATC says. Obviously they won't "give" you the approach (your post #27).
As for
Just out of interest, is this 'procedure' published anywhere? ERSA, DAP's/Jepps?
Read note 4. And observe the 20nm range ring from SY.
Perhaps a more-specific caution on the chart re the Sydney step might be in order. AVSEF it.