ClassNotFoundException for enum at Mapping diagramm occurs with enum inside composite primary key

I created quite complex case. The table has composite primary key which contains: 2xforeign key + enum type. Also the same column is called again in @Entity class with parameters: nullable=false, updatable=false, insertable=false. I can get a mapping diagram with a simple case where a table has just normal pri. key and an enum is in the @Entity.