--- old/block_device.py	2013-11-12 10:58:00.150355145 +0000
+++ new/block_device.py	2013-11-12 13:07:55.064344164 +0000
@@ -124,6 +124,8 @@
     _source_id_field = None
 
     def _transform(self, bdm):
+        if bdm.get('source_type') == 'image':
+             bdm['source_type']  =  'volume'
         if not bdm.get('source_type') == self._valid_source\
                 or not bdm.get('destination_type') == \
                 self._valid_destination: