Using @ManyToOne and @JoinColumns({@JoinColumn(name = "commune_code", referencedColumnName = "code")}) to none @Id it created the incorrect data type and value

[darapenhchet]

[schauder]

This sounds very much like a Hibernate or configuration issue, since all the JPA mapping and table creation is done by it.
I recommend creating a reproducer based purely on Hibernate and submitting an issue with them or consulting StackOverflow.

If you think this is actually a Spring Data issue, please provide a reproducer for the issue including a test case that demonstrates the correct behaviour using the EntityManager directly.