Can anyone use the JEL classification system? Can anyone use the JEL classification system, or is it only reserved for published (scientific) papers? This is the information I got on AEA's site

''JEL Codes are used to classify articles, dissertations, books, book reviews, and working papers''.

I'm working on a university thesis related to finance, and I wanted to use the JEL classification system. Does this fall under the category 'working papers'?
I asked the AEA helpdesk. This is the answer I got:

'Any work related to economics can be classified according to the JEL
taxonomy.   The list in that sentence is not intended to be an
exhaustive enumeration of where JEL Classifications are allowed to be used.'

Therefore it's perfectly fine to use the JEL classification in a master thesis, as long as the work is related to economics.