Oracle ADF in JDeveloper

I am new to both ADF Faces & JDeveloper and I tried the sample application Master/Detail/Detail/Detail program which is posted in http://radio.weblogs.com/0118231/stories/2004/09/23/notYetDocumentedAdfSampleApplications.html. What is the possible way to give the foreign key reference between two entities in JDEveloper. Physically there is no relation between these two tables(Entities).
It would be helpful if you give me a basic steps required to re create this application.
Thanks in advance

See section 5.10.2 "How to Create Master/Detail Hierarchies Using View Links" in the ADF Developer's Guide for Forms/4GL Developers on the ADF Learning Center at http://www.oracle.com/technology/products/adf/learnadf.html
There is no requirement that the master/detail relationship you setup be based on an underlying foreign key at the DB level.
The sample you reference just uses the above technique to create a 4-level master/detail hierarchy, and then the pages were created by dragging and dropping appropriate collections from the data control palette.

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