Problem to create a handbook in Contributed module documentation

Hello.
I am trying to add a handbook for my contibuted module in Getting Started » Contributed modules » Contributed module documentation. I have created the first book page, but I can't select it as parent item for another page of my book, and it doesn't appear in the links under the "Contributed module documentation" menu.
My first page is http://drupal.org/node/400240 and the link "Add child page" is http://drupal.org/node/add/book?parent=11038. The parent parameter is not my first page node id...
Can someone help me ?