diff --git a/erpnext/patches/jan_mar_2012/dt_map_fix.py b/erpnext/patches/jan_mar_2012/dt_map_fix.py
new file mode 100644
index 0000000000..f669009786
--- /dev/null
+++ b/erpnext/patches/jan_mar_2012/dt_map_fix.py
@@ -0,0 +1,7 @@
+def execute():
+	import webnotes
+	from webnotes.modules.module_manager import reload_doc
+	webnotes.conn.sql("delete from `tabField Mapper Detail` where from_field = 'transaction_date' and parent in ('Sales Order-Delivery Note', 'Purchase Order-Purchase Receipt')")
+
+	reload_doc('stock', 'DocType Mapper', 'Sales Order-Delivery Note')
+	reload_doc('stock', 'DocType Mapper', 'Purchase Order-Purchase Receipt')