It shouldn't be that difficult. First of all, are you doing a top-down or meet-in-the-middle mapping? If it's top-down, it's a no brainer -- just make sure your target
EJB has a composite primary key and create a CMR as usual -- WebSphere will work everything out.
Meet-in-the-middle isn't much harder. First, make sure you begin by creating a foreign key in the table mapper for the source table that contains BOTH parts of the primary key of the target table. Obviously your source table will have to have two columns in it, one for each part of the foreign key. Then in the Map.xmi editor, you simply map that foreign key to the CMR relationship that you set up.
Kyle
