diff --git a/accounts/doctype/pos_setting/pos_setting.txt b/accounts/doctype/pos_setting/pos_setting.txt
index 80cb1ec..788af9e 100755
--- a/accounts/doctype/pos_setting/pos_setting.txt
+++ b/accounts/doctype/pos_setting/pos_setting.txt
@@ -1,8 +1,8 @@
 [
  {
-  "creation": "2013-04-30 12:58:25", 
+  "creation": "2013-05-09 13:16:11", 
   "docstatus": 0, 
-  "modified": "2013-05-03 14:36:24", 
+  "modified": "2013-05-23 12:52:09", 
   "modified_by": "Administrator", 
   "owner": "Administrator"
  }, 
@@ -213,6 +213,14 @@
   "options": "link:Print Heading"
  }, 
  {
+  "cancel": 1, 
+  "create": 1, 
+  "doctype": "DocPerm", 
+  "role": "System Manager", 
+  "write": 1
+ }, 
+ {
+  "cancel": 1, 
   "create": 1, 
   "doctype": "DocPerm", 
   "role": "Accounts Manager", 
diff --git a/accounts/doctype/sales_invoice/sales_invoice.py b/accounts/doctype/sales_invoice/sales_invoice.py
index d18b967..4c71cb3 100644
--- a/accounts/doctype/sales_invoice/sales_invoice.py
+++ b/accounts/doctype/sales_invoice/sales_invoice.py
@@ -74,9 +74,11 @@
 		self.set_aging_date()
 		self.set_against_income_account()
 		self.validate_c_form()
+		self.validate_rate_with_refdoc()
 		self.validate_time_logs_are_submitted()
 		self.validate_recurring_invoice()
 		
+		
 	def on_submit(self):
 		if cint(self.doc.is_pos) == 1:
 			if cint(self.doc.update_stock) == 1:
@@ -213,8 +215,9 @@
 		if self.doc.customer:
 			acc_head = webnotes.conn.sql("""select name from `tabAccount` 
 				where (name = %s or (master_name = %s and master_type = 'customer')) 
-				and docstatus != 2""", 
-				(cstr(self.doc.customer) + " - " + self.get_company_abbr(), self.doc.customer))
+				and docstatus != 2 and company = %s""", 
+				(cstr(self.doc.customer) + " - " + self.get_company_abbr(), 
+				self.doc.customer, self.doc.company))
 			
 			if acc_head and acc_head[0][0]:
 				return acc_head[0][0]
@@ -551,6 +554,19 @@
 
 			webnotes.conn.set(self.doc, 'c_form_no', '')
 			
+	def validate_rate_with_refdoc(self):
+		"""Validate values with reference document with previous document"""
+		for d in self.doclist.get({"parentfield": "entries"}):
+			if d.so_detail:
+				self.check_value("Sales Order", d.so_detail, d.export_rate, d.item_code)
+			if d.dn_detail:
+				self.check_value("Delivery Note", d.dn_detail, d.export_rate, d.item_code)
+				
+	def check_value(self, ref_dt, ref_dn, val, item_code):
+		ref_val = webnotes.conn.get_value(ref_dt + "Item", ref_dn, "export_rate")
+		if flt(ref_val) != val:
+			msgprint(_("Rate is not matching with ") + ref_dt + ": " + ref_dn + 
+				_(" for item: ") + item_code, raise_exception=True)
 
 	def update_current_stock(self):
 		for d in getlist(self.doclist, 'entries'):