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you can try with a DECODE(...), or something else that allow you to express some conditions, in the query of the VO that populates the element.
By the way, the fact that the sistem throws a nullPointerException is due to a wrong "ID" inserted as parameter of the method findChildRecursive().
Firstly you should know, and put, the correct ID in findChildRecursive() and then try to edit the query as i said above.