why, page-6

bcsca

indicating it ISNT a normal security

This isn't common nor public knowlege.

The ASX websites glossary of terms doesnt even explain that a contributing share is identified by a five letter code.
CONTRIBUTING SHARE:
Shares that have been partly paid for. At a future date the shareholder will be required to pay the balance outstanding, unless the company is a no liability company in which case shares can be forfeited instead.

Go to the ASX website and tell me honestly how long it takes you to find information explaining that a contributing share is identified by a five letter code. I will give you a hint, click on "market supervision and rules" and go from there.