I need help finding sources to help answer "what is sufficient notice for the purpose of making a third party liable under s 12 conveyancing act 1919 (nsw)".

My understanding of s 12 is that it enables an assignee of a legal chose in action to enforce the chose in action without the need for the assignee to be joined by the assignor as required in equity. As a result, I'm struggling to see where the third party comes into relevance unless the third party referred to is the assignee. If so, does the question mean: what is sufficient notice for the purposes of making a debtor liable to a third party under s 12?