Hello,
I do not understant how to map a many-to-many association where the m-n table contains other attributes than just the keays of the two mappend entities.

Example:
Project -> m-n -> User
where the m-n relation is qualified by a further attribute: a reference to the Role class.

Thank you for any hints!
Massimo

As a real entity for the n:m association (and map it with two one-to-manys from either side) or use a composite-element mapping. Search the forum and read the documentation.