[fix] [minor] validate same sales rate patch
diff --git a/patches/july_2013/p06_same_sales_rate.py b/patches/july_2013/p06_same_sales_rate.py
index ea429b2..8222d3b 100644
--- a/patches/july_2013/p06_same_sales_rate.py
+++ b/patches/july_2013/p06_same_sales_rate.py
@@ -3,11 +3,11 @@
 	webnotes.reload_doc("selling", "doctype", "selling_settings")
 	ss = webnotes.bean("Selling Settings")
 	
-	same_rate = webnotes.conn.sql("""select field, value from `tabSingles` 
-		where doctype = 'Global Defaults' and field = 'maintain_same_sales_rate'""")
-	if same_rate:
-		ss.doc.maintain_same_sales_rate = same_rate[1]
+	same_rate = webnotes.conn.get_value("Global Defaults", "maintain_same_sales_rate")
+
+	if same_rate or same_rate == 0:
+		ss.doc.maintain_same_sales_rate = same_rate
 	else:
 		ss.doc.maintain_same_sales_rate = 1
-	
+
 	ss.save()
\ No newline at end of file
diff --git a/setup/doctype/global_defaults/global_defaults.py b/setup/doctype/global_defaults/global_defaults.py
index 9be8499..7b0c277 100644
--- a/setup/doctype/global_defaults/global_defaults.py
+++ b/setup/doctype/global_defaults/global_defaults.py
@@ -33,7 +33,6 @@
 	'account_url':'account_url',
 	'session_expiry': 'session_expiry',
 	'disable_rounded_total': 'disable_rounded_total',
-	'maintain_same_sales_rate' : 'maintain_same_sales_rate',
 }
 
 class DocType: