Droppable inside Sortable not working

Droppable inside Sortable not working

I cannot get the droppable to work inside a sortable. Please see the jsfiddle example. I can add the elements to the sortable, but cannot add elements to the droppable nested inside the sortable. If I destory the sortable then the droppable works.

http://jsfiddle.net/dan2012/vMnQM/