The property AUSTLANG code (P1252) is an external identifier that can receive values like "N112" or "L3".
When I try to add this property to an item and enter "L3" as a value, the abusefilter that has been set up to prevent entering Lexemes in items is activated, providing the error: "Could not save due to an error. The save has failed. Lexemes cannot currently be used on items or properties due to a bug."