Hibernate is generating wrong jointable

So I'm trying to lay a onetomany relationship between 2 tables in a different database, I have the following mapping:

    @OneToMany
    @JoinTable(
            name = "CountryEntityCountry",
            joinColumns = @JoinColumn(name = "countryEntityId"),
            inverseJoinColumns = @JoinColumn(name = "countryId")
    )
    @Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
    public Set<Country> getDestinationCountries() {
        return destinationCountries;
    }

countryEntityId points back to my own entity CountryEntity, countryId points to a table in another database. Obviously I'd want hibernate to generate a clustered primary key, this is the sql generated by hibernate in MS SQL server:

USE [dbNcrt]
GO

/****** Object:  Table [dbo].[CountryEntityCountry]    Script Date: 05/06/2015 08:51:44 ******/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

CREATE TABLE [dbo].[CountryEntityCountry](
    [countryEntityId] [numeric](19, 0) NOT NULL,
    [countryId] [numeric](19, 0) NOT NULL,
PRIMARY KEY CLUSTERED 
(
    [countryEntityId] ASC,
    [countryId] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [FG_DATA],
UNIQUE NONCLUSTERED 
(
    [countryId] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_R

OW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [FG_DATA]
) ON [FG_DATA]

GO

ALTER TABLE [dbo].[CountryEntityCountry]  WITH CHECK ADD  CONSTRAINT [FK6DAE065D46A920C0] FOREIGN KEY([countryEntityId])
REFERENCES [dbo].[CountryEntity] ([id])
GO

ALTER TABLE [dbo].[CountryEntityCountry] CHECK CONSTRAINT [FK6DAE065D46A920C0]
GO

Now for some reason hibernate is adding a unique constraint to the key on the MANY side. I don't mind having hibernate generate a unique constraint, but I'd appreciate it if it could be on the correct side, not on the many side, obviously I will have rows like:

• 1 245
• 1 234
• 2 245 -> Crash here already because of Hibernate's wrongfully generated unique constraint

Why is hibernate doing this? Is there something wrong with my mapping? I even tried adding explicitly unique=false to the countryId @JoinColumn, also tried adding the target entity explicitly, both of which hibernate seemed to have ignored.