=== modified file 'sale/stock.py'
--- sale/stock.py	2010-08-19 13:10:04 +0000
+++ sale/stock.py	2010-09-23 17:57:53 +0000
@@ -197,7 +197,7 @@
             call_ship_end = True
             if pick.sale_id:
                 for picks in pick.sale_id.picking_ids:
-                    if picks.state not in ('done','cancel'):
+                    if picks.state in ('done','cancel') and (not picks.backorder_id or picks.backorder_id.state != 'done'):
                         call_ship_end = False
                         break
                 if call_ship_end: