[#1144] - report with xml datasource

I'm using iReport 2.0.0 on a Windows XP platform.

The report I'm trying to develop has an XML data source.
It's about a process which contains 2 tasks and several input and deliverable items.

There are two input items with the first task and one input item with the second task. But he only shows one input item with the first task and no item with the second task. I have the same problem with the deliverable items (i.e. he won't show anything except 'null').