diff --git a/erpnext/patches/august_2012/repost_billed_amt.py b/erpnext/patches/august_2012/repost_billed_amt.py
new file mode 100644
index 0000000..e6b463c
--- /dev/null
+++ b/erpnext/patches/august_2012/repost_billed_amt.py
@@ -0,0 +1,9 @@
+def execute():
+	import webnotes
+	from webnotes.model.code import get_obj
+	from selling.doctype.sales_common.sales_common import StatusUpdater
+	
+	invoices = webnotes.conn.sql("select name from `tabSales Invoice` where docstatus = 1")
+	for inv in invoices:
+		inv_obj = get_obj('Sales Invoice', inv[0], with_children=1)
+		StatusUpdater(inv_obj, 1).update_all_qty()
\ No newline at end of file
diff --git a/erpnext/selling/doctype/sales_common/sales_common.py b/erpnext/selling/doctype/sales_common/sales_common.py
index 57724ac..b3d9f40 100644
--- a/erpnext/selling/doctype/sales_common/sales_common.py
+++ b/erpnext/selling/doctype/sales_common/sales_common.py
@@ -689,14 +689,14 @@
 			self.validate_qty({
 				'source_dt'		:'Sales Invoice Item',
 				'compare_field'	:'billed_amt',
-				'compare_ref_field'	:'amount',
+				'compare_ref_field'	:'export_amount',
 				'target_dt'		:'Sales Order Item',
 				'join_field'	:'so_detail'
 			})
 			self.validate_qty({
 				'source_dt'		:'Sales Invoice Item',
 				'compare_field'	:'billed_amt',
-				'compare_ref_field'	:'amount',
+				'compare_ref_field'	:'export_amount',
 				'target_dt'		:'Delivery Note Item',
 				'join_field'	:'dn_detail'
 			}, no_tolerance =1)
@@ -808,9 +808,9 @@
 				'target_dt'				:'Sales Order Item',
 				'target_parent_dt'		:'Sales Order',
 				'target_parent_field'	:'per_billed',
-				'target_ref_field'		:'amount',
+				'target_ref_field'		:'export_amount',
 				'source_dt'				:'Sales Invoice Item',
-				'source_field'			:'amount',
+				'source_field'			:'export_amount',
 				'join_field'			:'so_detail',
 				'percent_join_field'	:'sales_order',
 				'status_field'			:'billing_status',
@@ -822,9 +822,9 @@
 				'target_dt'				:'Delivery Note Item',
 				'target_parent_dt'		:'Delivery Note',
 				'target_parent_field'	:'per_billed',
-				'target_ref_field'		:'amount',
+				'target_ref_field'		:'export_amount',
 				'source_dt'				:'Sales Invoice Item',
-				'source_field'			:'amount',
+				'source_field'			:'export_amount',
 				'join_field'			:'dn_detail',
 				'percent_join_field'	:'delivery_note',
 				'status_field'			:'billing_status',