diff --git a/patches/april_2013/p01_update_serial_no_valuation_rate.py b/patches/april_2013/p01_update_serial_no_valuation_rate.py
index 1058473478..2ea0c26a55 100644
--- a/patches/april_2013/p01_update_serial_no_valuation_rate.py
+++ b/patches/april_2013/p01_update_serial_no_valuation_rate.py
@@ -3,6 +3,8 @@ from webnotes.utils import cstr
 from stock.stock_ledger import update_entries_after
 
 def execute():
+	webnotes.conn.auto_commit_on_many_writes = 1
+	
 	pr_items = webnotes.conn.sql("""select item_code, warehouse, serial_no, valuation_rate, name 
 		from `tabPurchase Receipt Item` where ifnull(serial_no, '') != '' and docstatus = 1""", 
 		as_dict=True)
@@ -13,14 +15,21 @@ def execute():
 		serial_nos = cstr(item.serial_no).strip().split("\n")
 		serial_nos = map(lambda x: x.strip(), serial_nos)
 
-		webnotes.conn.sql("""update `tabPurchase Receipt Item` set serial_no = %s 
-			where name = %s""", ("\n".join(serial_nos), item.name))
+		if cstr(item.serial_no) != "\n".join(serial_nos):
+			webnotes.conn.sql("""update `tabPurchase Receipt Item` set serial_no = %s 
+				where name = %s""", ("\n".join(serial_nos), item.name))
+			
+			if [item.item_code, item.warehouse] not in item_warehouse:
+				item_warehouse.append([item.item_code, item.warehouse])
 		
-		webnotes.conn.sql("""update `tabSerial No` set purchase_rate = %s where name in (%s)""" % 
-			('%s', ', '.join(['%s']*len(serial_nos))), tuple([item.valuation_rate] + serial_nos))
-
-		if [item.item_code, item.warehouse] not in item_warehouse:
-			item_warehouse.append([item.item_code, item.warehouse])
+			webnotes.conn.sql("""update `tabSerial No` set purchase_rate = %s 
+				where name in (%s)""" % ('%s', ', '.join(['%s']*len(serial_nos))), 
+				tuple([item.valuation_rate] + serial_nos))
 
 	for d in item_warehouse:
-		update_entries_after({"item_code": d[0], "warehouse": d[1] })
\ No newline at end of file
+		try:
+			update_entries_after({"item_code": d[0], "warehouse": d[1] })
+		except:
+			continue
+			
+	webnotes.conn.auto_commit_on_many_writes = 0
\ No newline at end of file