Table "GROUP: {
code varchar(40) not null PK,
name varchar(400)
}

Table "GROUP: {
    bs_key varchar(40) not null,
    code varchar(40) not null,
    name varchar(400),
    primary key (bs_key,code)
}

bs_key      code     name
======================================
device_A    0001     Group in device A
device_B    0001     Group in device B

@OneToOne(fetch = FetchType.EAGER, optional = true)
    @JoinColumns({
            @JoinColumn(updatable = false, insertable = false, name = "BUSINESS_KEY", referencedColumnName = "BUSINESS_KEY"),
            @JoinColumn(updatable = false, insertable = false, name = "DETAIL_CODE", referencedColumnName = "CODE")
    })
    @Expose
    private TestDetail detail;