diff --git a/erpnext/selling/doctype/installation_note/installation_note.py b/erpnext/selling/doctype/installation_note/installation_note.py
index e2e7ee6..016947b 100644
--- a/erpnext/selling/doctype/installation_note/installation_note.py
+++ b/erpnext/selling/doctype/installation_note/installation_note.py
@@ -50,14 +50,6 @@
 			if not frappe.db.exists("Serial No", x):
 				frappe.throw(_("Serial No {0} does not exist").format(x))
 
-	def is_serial_no_installed(self,cur_s_no,item_code):
-		for x in cur_s_no:
-			status = frappe.db.sql("select status from `tabSerial No` where name = %s", x)
-			status = status and status[0][0] or ''
-
-			if status == 'Installed':
-				frappe.throw(_("Item {0} with Serial No {1} is already installed").format(item_code, x))
-
 	def get_prevdoc_serial_no(self, prevdoc_detail_docname):
 		serial_nos = frappe.db.get_value("Delivery Note Item",
 			prevdoc_detail_docname, "serial_no")
@@ -80,7 +72,6 @@
 				if prevdoc_s_no:
 					self.is_serial_no_match(sr_list, prevdoc_s_no, d.prevdoc_docname)
 
-				self.is_serial_no_installed(sr_list, d.item_code)
 
 	def validate_installation_date(self):
 		for d in self.get('items'):
@@ -102,11 +93,5 @@
 		frappe.db.set(self, 'status', 'Submitted')
 
 	def on_cancel(self):
-		for d in self.get('items'):
-			if d.serial_no:
-				d.serial_no = d.serial_no.replace(",", "\n")
-				for sr_no in d.serial_no.split("\n"):
-					frappe.db.set_value("Serial No", sr_no, "status", "Delivered")
-
 		self.update_prevdoc_status()
 		frappe.db.set(self, 'status', 'Cancelled')
diff --git a/erpnext/stock/get_item_details.py b/erpnext/stock/get_item_details.py
index fb661e1..3fa3ea9 100644
--- a/erpnext/stock/get_item_details.py
+++ b/erpnext/stock/get_item_details.py
@@ -325,7 +325,7 @@
 def get_serial_nos_by_fifo(args, item_doc):
 	if frappe.db.get_single_value("Stock Settings", "automatically_set_serial_nos_based_on_fifo"):
 		return "\n".join(frappe.db.sql_list("""select name from `tabSerial No`
-			where item_code=%(item_code)s and warehouse=%(warehouse)s and status='Available'
+			where item_code=%(item_code)s and warehouse=%(warehouse)s
 			order by timestamp(purchase_date, purchase_time) asc limit %(qty)s""", {
 				"item_code": args.item_code,
 				"warehouse": args.warehouse,
diff --git a/erpnext/stock/report/serial_no_service_contract_expiry/serial_no_service_contract_expiry.json b/erpnext/stock/report/serial_no_service_contract_expiry/serial_no_service_contract_expiry.json
index 1c4547a..5ab5e64 100644
--- a/erpnext/stock/report/serial_no_service_contract_expiry/serial_no_service_contract_expiry.json
+++ b/erpnext/stock/report/serial_no_service_contract_expiry/serial_no_service_contract_expiry.json
@@ -1,12 +1,14 @@
 {
+ "add_total_row": 0, 
  "apply_user_permissions": 1, 
  "creation": "2013-01-14 10:52:58", 
+ "disabled": 0, 
  "docstatus": 0, 
  "doctype": "Report", 
  "idx": 1, 
  "is_standard": "Yes", 
- "json": "{\"filters\":[[\"Serial No\",\"status\",\"=\",\"Delivered\"]],\"columns\":[[\"name\",\"Serial No\"],[\"item_code\",\"Serial No\"],[\"amc_expiry_date\",\"Serial No\"],[\"maintenance_status\",\"Serial No\"],[\"delivery_document_no\",\"Serial No\"],[\"customer\",\"Serial No\"],[\"customer_name\",\"Serial No\"],[\"item_name\",\"Serial No\"],[\"description\",\"Serial No\"],[\"item_group\",\"Serial No\"],[\"brand\",\"Serial No\"]],\"sort_by\":\"Serial No.amc_expiry_date\",\"sort_order\":\"asc\",\"sort_by_next\":\"\",\"sort_order_next\":\"desc\"}", 
- "modified": "2014-06-03 07:18:17.322563", 
+ "json": "{\"filters\":[[\"Serial No\",\"delivery_document_type\",\"in\",[\"Delivery Note\",\"Sales Invoice\"]],[\"Serial No\",\"warehouse\",\"=\",\"\"]],\"columns\":[[\"name\",\"Serial No\"],[\"item_code\",\"Serial No\"],[\"amc_expiry_date\",\"Serial No\"],[\"maintenance_status\",\"Serial No\"],[\"delivery_document_no\",\"Serial No\"],[\"customer\",\"Serial No\"],[\"customer_name\",\"Serial No\"],[\"item_name\",\"Serial No\"],[\"description\",\"Serial No\"],[\"item_group\",\"Serial No\"],[\"brand\",\"Serial No\"]],\"sort_by\":\"Serial No.modified\",\"sort_order\":\"desc\",\"sort_by_next\":null,\"sort_order_next\":\"desc\"}", 
+ "modified": "2015-10-22 14:53:45.192497", 
  "modified_by": "Administrator", 
  "module": "Stock", 
  "name": "Serial No Service Contract Expiry", 
diff --git a/erpnext/stock/report/serial_no_status/serial_no_status.json b/erpnext/stock/report/serial_no_status/serial_no_status.json
index 917d26f..dfc7afc 100644
--- a/erpnext/stock/report/serial_no_status/serial_no_status.json
+++ b/erpnext/stock/report/serial_no_status/serial_no_status.json
@@ -7,8 +7,8 @@
  "doctype": "Report", 
  "idx": 1, 
  "is_standard": "Yes", 
- "json": "{\"filters\":[],\"columns\":[[\"name\",\"Serial No\"],[\"item_code\",\"Serial No\"],[\"warehouse\",\"Serial No\"],[\"status\",\"Serial No\"],[\"item_name\",\"Serial No\"],[\"description\",\"Serial No\"],[\"item_group\",\"Serial No\"],[\"brand\",\"Serial No\"],[\"purchase_document_no\",\"Serial No\"],[\"purchase_date\",\"Serial No\"],[\"customer\",\"Serial No\"],[\"customer_name\",\"Serial No\"],[\"purchase_rate\",\"Serial No\"],[\"delivery_document_no\",\"Serial No\"],[\"delivery_date\",\"Serial No\"],[\"supplier\",\"Serial No\"],[\"supplier_name\",\"Serial No\"]],\"sort_by\":\"Serial No.name\",\"sort_order\":\"desc\",\"sort_by_next\":null,\"sort_order_next\":\"desc\"}", 
- "modified": "2015-09-20 21:09:49.441973", 
+ "json": "{\"filters\":[],\"columns\":[[\"name\",\"Serial No\"],[\"item_code\",\"Serial No\"],[\"warehouse\",\"Serial No\"],[\"item_name\",\"Serial No\"],[\"description\",\"Serial No\"],[\"item_group\",\"Serial No\"],[\"brand\",\"Serial No\"],[\"purchase_document_no\",\"Serial No\"],[\"purchase_date\",\"Serial No\"],[\"customer\",\"Serial No\"],[\"customer_name\",\"Serial No\"],[\"purchase_rate\",\"Serial No\"],[\"delivery_document_no\",\"Serial No\"],[\"delivery_date\",\"Serial No\"],[\"supplier\",\"Serial No\"],[\"supplier_name\",\"Serial No\"]],\"sort_by\":\"Serial No.name\",\"sort_order\":\"desc\",\"sort_by_next\":null,\"sort_order_next\":\"desc\"}", 
+ "modified": "2015-10-22 14:49:29.491790", 
  "modified_by": "Administrator", 
  "module": "Stock", 
  "name": "Serial No Status", 
diff --git a/erpnext/stock/report/serial_no_warranty_expiry/serial_no_warranty_expiry.json b/erpnext/stock/report/serial_no_warranty_expiry/serial_no_warranty_expiry.json
index a3aa567..2a919af 100644
--- a/erpnext/stock/report/serial_no_warranty_expiry/serial_no_warranty_expiry.json
+++ b/erpnext/stock/report/serial_no_warranty_expiry/serial_no_warranty_expiry.json
@@ -1,12 +1,14 @@
 {
+ "add_total_row": 0, 
  "apply_user_permissions": 1, 
  "creation": "2013-01-14 10:52:58", 
+ "disabled": 0, 
  "docstatus": 0, 
  "doctype": "Report", 
  "idx": 1, 
  "is_standard": "Yes", 
- "json": "{\"filters\":[[\"Serial No\",\"status\",\"=\",\"Delivered\"]],\"columns\":[[\"name\",\"Serial No\"],[\"item_code\",\"Serial No\"],[\"warranty_expiry_date\",\"Serial No\"],[\"warranty_period\",\"Serial No\"],[\"maintenance_status\",\"Serial No\"],[\"purchase_document_no\",\"Serial No\"],[\"purchase_date\",\"Serial No\"],[\"supplier\",\"Serial No\"],[\"supplier_name\",\"Serial No\"],[\"delivery_document_no\",\"Serial No\"],[\"delivery_date\",\"Serial No\"],[\"customer\",\"Serial No\"],[\"customer_name\",\"Serial No\"],[\"item_name\",\"Serial No\"],[\"description\",\"Serial No\"],[\"item_group\",\"Serial No\"],[\"brand\",\"Serial No\"]],\"sort_by\":\"Serial No.warranty_expiry_date\",\"sort_order\":\"asc\",\"sort_by_next\":\"\",\"sort_order_next\":\"asc\"}", 
- "modified": "2014-06-03 07:18:17.332902", 
+ "json": "{\"filters\":[[\"Serial No\",\"delivery_document_type\",\"in\",[\"Delivery Note\",\"Sales Invoice\"]],[\"Serial No\",\"warehouse\",\"=\",\"\"]],\"columns\":[[\"name\",\"Serial No\"],[\"item_code\",\"Serial No\"],[\"warranty_expiry_date\",\"Serial No\"],[\"warranty_period\",\"Serial No\"],[\"maintenance_status\",\"Serial No\"],[\"purchase_document_no\",\"Serial No\"],[\"purchase_date\",\"Serial No\"],[\"supplier\",\"Serial No\"],[\"supplier_name\",\"Serial No\"],[\"delivery_document_no\",\"Serial No\"],[\"delivery_date\",\"Serial No\"],[\"customer\",\"Serial No\"],[\"customer_name\",\"Serial No\"],[\"item_name\",\"Serial No\"],[\"description\",\"Serial No\"],[\"item_group\",\"Serial No\"],[\"brand\",\"Serial No\"]],\"sort_by\":\"Serial No.modified\",\"sort_order\":\"desc\",\"sort_by_next\":null,\"sort_order_next\":\"desc\"}", 
+ "modified": "2015-10-22 14:53:12.575608", 
  "modified_by": "Administrator", 
  "module": "Stock", 
  "name": "Serial No Warranty Expiry", 
diff --git a/erpnext/stock/stock_balance.py b/erpnext/stock/stock_balance.py
index faf5b06..efc604b 100644
--- a/erpnext/stock/stock_balance.py
+++ b/erpnext/stock/stock_balance.py
@@ -164,7 +164,7 @@
 
 	for d in bin:
 		serial_nos = frappe.db.sql("""select count(name) from `tabSerial No`
-			where item_code=%s and warehouse=%s and status = 'Available' and docstatus < 2""", (d[0], d[1]))
+			where item_code=%s and warehouse=%s and docstatus < 2""", (d[0], d[1]))
 
 		if serial_nos and flt(serial_nos[0][0]) != flt(d[2]):
 			print d[0], d[1], d[2], serial_nos[0][0]
diff --git a/erpnext/support/doctype/maintenance_schedule/maintenance_schedule.py b/erpnext/support/doctype/maintenance_schedule/maintenance_schedule.py
index 9ac1133..ef3af41 100644
--- a/erpnext/support/doctype/maintenance_schedule/maintenance_schedule.py
+++ b/erpnext/support/doctype/maintenance_schedule/maintenance_schedule.py
@@ -182,7 +182,7 @@
 	def validate_serial_no(self, serial_nos, amc_start_date):
 		for serial_no in serial_nos:
 			sr_details = frappe.db.get_value("Serial No", serial_no,
-				["warranty_expiry_date", "amc_expiry_date", "status", "delivery_date"], as_dict=1)
+				["warranty_expiry_date", "amc_expiry_date", "warehouse", "delivery_date"], as_dict=1)
 
 			if not sr_details:
 				frappe.throw(_("Serial No {0} not found").format(serial_no))
@@ -193,9 +193,10 @@
 			if sr_details.amc_expiry_date and sr_details.amc_expiry_date >= amc_start_date:
 				throw(_("Serial No {0} is under maintenance contract upto {1}").format(serial_no, sr_details.amc_start_date))
 
-			if sr_details.status=="Delivered" and sr_details.delivery_date and \
+			if not sr_details.warehouse and sr_details.delivery_date and \
 				sr_details.delivery_date >= amc_start_date:
-					throw(_("Maintenance start date can not be before delivery date for Serial No {0}").format(serial_no))
+					throw(_("Maintenance start date can not be before delivery date for Serial No {0}")
+						.format(serial_no))
 
 	def validate_schedule(self):
 		item_lst1 =[]