charts..., page-23

JW,

Hope this helps (refer to the last point in answer to your question):-

NXXT

What is a National Best Bid/Offer Crossing?

A National Best Bid/Offer Crossing is a crossing transaction which meets the conditions set out in the relevant Rules. A National Best Bid/Offer Crossing may be executed in Equity Market products.

Order and Trade History

National Best Bid/Offer Crossings are displayed to all ASX Trade users in the Trade History window with a condition code of NXXT.

New and Fill order records are displayed in the Order History window with condition code NX and may be viewed by all users of your Trading Participant.

Impact on Market Statistics

National Best Bid/Offer Crossings do not update official prices such as open, high, low, last or closing prices, however, they do update the daily trade statistics of volume and value only.

https://www.asxonline.com/intradoc-cgi/groups/participant_services/documents/manuals/asx_016426.pdf