Android Question CustomListView inside CustomListView

I have I listview of the size of my screen. One of its Panels contains another CLV, with a fixed height.

I works fine scrolling within the second list view, only if the first CLV fits inside my screen. It seems that when you try the scroll the second CLV, y turns out that only scrolls the outside CLV. How can enable scrolling on both?

Thanks
FBP