Lead selection, not displaying?

I have a Java Web Dynpro application which has complicated nested context structure. One of the context nodes contains a list of items,one of which is of course selected. I would like to, on the Adobe form I'm generating, display the selected item. With Web Dynpro, all you do is create a single element item, and point it at the node, and the selected item will be displayed. However, with Adobe Documents, the first element in the list is being displayed, not the selected one.

Is there something special I have to do to get the selected element displayed?