diff --git a/controllers/buying_controller.py b/controllers/buying_controller.py
index 28d2db6..3deda02 100644
--- a/controllers/buying_controller.py
+++ b/controllers/buying_controller.py
@@ -367,13 +367,13 @@
 			if d.item_code and d.qty:
 				# if no item code, which is sometimes the case in purchase invoice, 
 				# then it is not possible to track valuation against it
-				d.valuation_rate = flt((flt(d.purchase_rate, self.precision.item.purchase_rate) or 
-					flt(d.rate, self.precision.item.rate) + 
+				d.valuation_rate = flt(((flt(d.purchase_rate, self.precision.item.purchase_rate) or 
+					flt(d.rate, self.precision.item.rate)) + 
 					(flt(d.item_tax_amount, self.precision.item.item_tax_amount) + 
 					flt(d.rm_supp_cost, self.precision.item.rm_supp_cost)) / 
 					flt(d.qty, self.precision.item.qty)) / 
 					flt(d.conversion_factor, self.precision.item.conversion_factor), 
-					self.precision.item.valuation_rate)					
+					self.precision.item.valuation_rate)	
 			else:
 				d.valuation_rate = 0.0
 				
diff --git a/patches/may_2013/p02_update_valuation_rate.py b/patches/may_2013/p02_update_valuation_rate.py
new file mode 100644
index 0000000..280473c
--- /dev/null
+++ b/patches/may_2013/p02_update_valuation_rate.py
@@ -0,0 +1,47 @@
+# ERPNext - web based ERP (http://erpnext.com)
+# Copyright (C) 2012 Web Notes Technologies Pvt Ltd
+# 
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+# 
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from __future__ import unicode_literals
+import webnotes
+def execute():
+	from stock.stock_ledger import update_entries_after
+	item_warehouse = []
+	# update valuation_rate in transaction
+	doctypes = {"Purchase Receipt": "purchase_receipt_details", "Purchase Invoice": "entries"}
+	
+	for dt in doctypes:
+		for d in webnotes.conn.sql("""select name from `tab%s` 
+				where modified >= '2013-05-09' and docstatus=1""" % dt):
+			rec = webnotes.get_obj(dt, d[0])
+			rec.update_valuation_rate(doctypes[dt])
+			
+			for item in rec.doclist.get({"parentfield": doctypes[dt]}):
+				webnotes.conn.sql("""update `tab%s Item` set valuation_rate = %s 
+					where name = %s"""% (dt, '%s', '%s'), tuple([item.valuation_rate, item.name]))
+					
+				if dt == "Purchase Receipt":
+					webnotes.conn.sql("""update `tabStock Ledger Entry` set incoming_rate = %s 
+						where voucher_detail_no = %s""", (item.valuation_rate, item.name))
+					if [item.item_code, item.warehouse] not in item_warehouse:
+						item_warehouse.append([item.item_code, item.warehouse])
+			
+	for d in item_warehouse:
+		try:
+			update_entries_after({"item_code": d[0], "warehouse": d[1], 
+				"posting_date": "2013-01-01", "posting_time": "00:05:00"})
+			webnotes.conn.commit()
+		except:
+			pass
\ No newline at end of file
diff --git a/patches/patch_list.py b/patches/patch_list.py
index 1610009..bd7acb2 100644
--- a/patches/patch_list.py
+++ b/patches/patch_list.py
@@ -248,4 +248,5 @@
 	"patches.april_2013.p08_price_list_country",
 	"patches.may_2013.repost_stock_for_no_posting_time",
 	"patches.may_2013.p01_conversion_factor_and_aii",
+	"patches.may_2013.p02_update_valuation_rate",
 ]
\ No newline at end of file