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Queries and "column not found" error

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Hibernate Python MySQL Database
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I'm really having a hard time getting a DB design to work with Hibernate. I have several kinds of composite keys and some IDs as well, but nearly anything that could be considered exotic. The latest strangeness of Hibernate producing an error on the native query:

Hibernate chokes with an error that appears to be completely unrelated (there's only a multi-column many-to-one association in PlayerStats):

Somehow Hibernate seems to be expecting a column here, but again the association is multi-column. Regarding this issue I stumbled across:

A paragraph here reads:

If the entity is mapped with a many-to-one to another entity it is required to also return this when performing the native query, otherwise a database specific "column not found" error will occur. The additional columns will automatically be returned when using the * notation...

Well, this is nice to know, but how do you avoid this error?

Here's the design:
Please have a look at the PlayerStats table being connected to two other tables via a composite key of composite keys. Here's its class:

I have no idea what Hibernate is doing here. I really need some help on this.

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