> "the book field in the PageId class must be of type String to match > the primary key field type of Book" > > was i mistaken when i understood you to say that Page could have a > PK field of type Book?
No, you weren't mistaken. But as I said, the book field in the Page*Id* class must match the pk type of the relation. Check the example in the docs. Notice: This email message, together with any attachments, may contain information of BEA Systems, Inc., its subsidiaries and affiliated entities, that may be confidential, proprietary, copyrighted and/or legally privileged, and is intended solely for the use of the individual or entity named in this message. If you are not the intended recipient, and have received this message in error, please immediately return this by email and then delete it.
