You are reading about a law called the Mutual Assistance in Criminal Matters Act 1992. In this law, some words have special meanings. The word "document" means the same as it does in section 70 of the Search and Surveillance Act 2012. You will also see the term "notifiable person", which has the same meaning as in section 49A. When the law talks about something produced under a production order, it is talking about a document produced under that order.