Same issue with subqueries in JPQL UPDATE.
UPDATE Address AS a SET a.version = a.version + 1, a.population = a.population -
(SELECT SUM(dept.num) FROM Departure dep, IN(dep.addresses) depa
WHERE depa = a AND dep.date = :date
)
WHERE ....

This JPQL transalated to SQL with "WHERE addresses2_.entityKey = entityKey" in the "SUM" subquery. While should be something like "WHERE addresses2_.entityKey = addresses1_entityKey". Where addresses1_ is an alias for table in the "UPDATE" clause.