diff --git a/erpnext/patches/jan_mar_2012/rename_dt.py b/erpnext/patches/jan_mar_2012/rename_dt.py
index 559e8a5..2492720 100644
--- a/erpnext/patches/jan_mar_2012/rename_dt.py
+++ b/erpnext/patches/jan_mar_2012/rename_dt.py
@@ -90,18 +90,17 @@
 def update_dt_in_records(rendt):
 	for d in rendt:
 		# Feed, property setter, search criteria, gl mapper, form 16A, naming series options, doclayer - dodtype is not mentioed in options
-		dt_list = webnotes.conn.sql("select parent, fieldname from tabDocField where fieldname in ('dt', 'doctype', 'doc_type', 'dt_type') and ifnull(options, '') = ''")
-		print dt_list
+		dt_list = webnotes.conn.sql("select t1.parent, t1.fieldname from tabDocField t1, tabDocType t2 where t1.parent = t2.name and t1.fieldname in ('dt', 'doctype', 'doc_type', 'dt_type') and ifnull(t1.options, '') = '' and ifnull(t2.issingle, 0) = 0")
 		for dt in dt_list:
-			webnotes.conn.sql("update `tab%s` set %s = replace(%s, '%s', '%s') where %s = '%s'" % (dt[0], dt[1], dt[1], d, rendt[d], dt[1], d), debug=1)
+			webnotes.conn.sql("update `tab%s` set %s = replace(%s, '%s', '%s') where %s = '%s'" % (dt[0], dt[1], dt[1], d, rendt[d], dt[1], d))
 
 		# gl mapper, gl entry
-		webnotes.conn.sql("update `tabGL Mapper Detail` set against_voucher_type = replace(against_voucher_type, %s, %s) where against_voucher_type like '%%%s%%'" % (d, rendt[d], d))
-		webnotes.conn.sql("update `tabGL Entry` set against_voucher_type = replace(against_voucher_type, %s, %s) where against_voucher_type = '%s'" % (d, rendt[d], d))
-		webnotes.conn.sql("update `tabGL Entry` set voucher_type = replace(voucher_type, %s, %s) where voucher_type = '%s'" % (d, rendt[d], d))
+		webnotes.conn.sql("update `tabGL Mapper Detail` set against_voucher_type = replace(against_voucher_type, '%s', '%s') where against_voucher_type like '%%%s%%'" % (d, rendt[d], d))
+		webnotes.conn.sql("update `tabGL Entry` set against_voucher_type = replace(against_voucher_type, '%s', '%s') where against_voucher_type = '%s'" % (d, rendt[d], d))
+		webnotes.conn.sql("update `tabGL Entry` set voucher_type = replace(voucher_type, '%s', '%s') where voucher_type = '%s'" % (d, rendt[d], d))
 
 		# Stock ledger entry
-		webnotes.conn.sql("update `tabStock ledger Entry` set voucher_type = replace(voucher_type, %s, %s) where voucher_type = '%s'" % (d, rendt[d], d))
+		webnotes.conn.sql("update `tabStock ledger Entry` set voucher_type = replace(voucher_type, '%s', '%s') where voucher_type = '%s'" % (d, rendt[d], d))
 
 		# Custom fld: options
 		webnotes.conn.sql("update `tabCustom Field` set options = replace(options, %s, %s) where fieldtype in ('Link', 'Select')", (d, rendt[d]))
@@ -143,13 +142,6 @@
 
 
 def get_dt_to_be_renamed():
-	"""rendt = {
-		'Receivable Voucher'		:	'Sales Invoice',
-		'RV Detail'					:	'Sales Invoice Item',
-		'RV Tax Detail'				:	'Sales Taxes and Charges',
-		'Advance Adjustment Detail' :	'Sales Invoice Advance',
-}"""
-
 	rendt = {
 		'Receivable Voucher'		:	'Sales Invoice',
 		'RV Detail'					:	'Sales Invoice Item',
@@ -230,12 +222,6 @@
 
 
 def get_mapper_to_be_renamed():
-	"""ren_mapper = {	
-		'Sales Order-Receivable Voucher'	:	'Sales Order-Sales Invoice',
-		'Receivable Voucher-Delivery Note' 	: 	'Sales Invoice-Delivery Note',
-		'Delivery Note-Receivable Voucher'	: 	'Delivery Note-Sales Invoice'
-	}"""
-
 	ren_map = {
 		'Sales Order-Receivable Voucher'	:	'Sales Order-Sales Invoice',
 		'Sales Order-Indent'				: 	'Sales Order-Purchase Request',