Hibernate: column does not exist

When I try to get an entry using the CrudRepository of Spring, I get a

Caused by: org.postgresql.util.PSQLException: ERROR: column appuser0_.useraccount_account_id does not exist

But in my database this column is named

    useraccount_account_id

I even tried to define the column name explicitly via

    @JoinColumn(name = "useraccount_account_id")

but no effect. At the moment I'm using the ImprovedNamingStrategy, Database is Postgres 9.4.

Any ideas what I could try? Never had an issue like that and after heavily restructuring the project I cannot find the cause...