How to retrieve attribute from custom query

Q&A
1

I created a custom query in BDM queries, it selects the last item in the Param table:

SELECT MAX(p) FROM Param p
ORDER BY p.persistenceId DESC

I'm trying to use this query in a process variable to retrieve the attribute Price, I tried two ways:

parametreDAO.findLastSeuil().price 

parametreDAO.findLastSeuil().getPrice()

But I got this error: 

org.hibernate.exception.SQLGrammarException: could not extract ResultSet   Any idea how to do that?
2

It worked using the find query like this: 

parametreDAO.find(parametreDAO.countForFind()-1, 1).get(0).price