Drupal 6.10 - Windows XP / Mysql

Hi all,

I'd like to know if it is possible to create a content (story, page, or whatever) that belongs to a book page, and prevent this content to be a parent element of another content.

Here is an example:

Development (book page)
-- Java (book page)
---- Libraries (book page)
------ Struts (book page)
-------- Article Struts 1 (story)

When the story 'Article Struts 1' is displayed, I can add a child. I would like to prevent it. (I want the 'Article Struts 1' to be a 'leaf' of the hierarchy).
In the same way, if I create a new content that belongs to the 'Development' book page, I can choose 'Article Struts 1' as the parent element, and I don't want it !

Is it possible to do that with the book pages or do I have to use the node hierarchy module (or maybe another one) ?

Thank you in advance for your answers.

Lo