net.sf.hibernate.MappingException: Repeated column in mapping for collection: bean.Region.employeeIds column: employee_id

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net.sf.hibernate.MappingException: Repeated column in mapping for collection: bean.Region.employeeIds column: employee_id
at net.sf.hibernate.collection.CollectionPersister.checkColumnDuplication(CollectionPersister.java:884)
at net.sf.hibernate.collection.CollectionPersister.(CollectionPersister.java:193)
at net.sf.hibernate.impl.SessionFactoryImpl.(SessionFactoryImpl.java:146)
at net.sf.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:647)

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