https://iknow.cch.com.au/practice-area-browse-tree/atagUio1978404...

https://iknow.cch.com.au/practice-area-browse-tree/atagUio1978404sl335876983/csh-da-filter!WKAP_TAL_XLEGCOREL3_REFERENCE_2/Guidance-Note-12-%E2%80%94-Significant-Changes-to-Activities/standard_tab/?contentType=Regulatory%20resources%20and%20forms&paId=companies

For clarity and ease of application by listed entities, ASX has adopted 25% as an appropriate benchmark for determining whether or not a transaction involves a significant change to the scale of an entity’s activities that requires notification to ASX under Listing Rule 11.1. This is also helpful to ASX in ensuring that transactions of a certain size that might also lead to a significant change in the nature of an entity’s activities are notified to ASX under Listing Rule 11.1.

Hope this comes soon.