diff --git a/patches/november_2012/update_delivered_billed_percentage_for_pos.py b/patches/november_2012/update_delivered_billed_percentage_for_pos.py
index 3e9adf4..502a36a 100644
--- a/patches/november_2012/update_delivered_billed_percentage_for_pos.py
+++ b/patches/november_2012/update_delivered_billed_percentage_for_pos.py
@@ -4,7 +4,7 @@
 	
 	sc_obj = get_obj("Sales Common")
 	
-	si = webnotes.conn.sql("""select si.name 
+	si = webnotes.conn.sql("""select distinct si.name 
 		from `tabSales Invoice` si, `tabSales Invoice Item` si_item
 		where si_item.parent = si.name
 		and si.docstatus = 1