diff --git a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
index 614c13a315b..262ac223862 100644
--- a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
+++ b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
@@ -383,20 +383,20 @@ class SalesInvoice(SellingController):
 
 
 	def get_warehouse(self):
-		w = frappe.db.sql("""select warehouse from `tabPOS Setting`
-			where ifnull(user,'') = %s and company = %s""",
-			(frappe.session['user'], self.company))
-		w = w and w[0][0] or ''
-		if not w:
-			ps = frappe.db.sql("""select name, warehouse from `tabPOS Setting`
+		user_pos_setting = frappe.db.sql("""select name, warehouse from `tabPOS Setting`
+			where ifnull(user,'') = %s and company = %s""", (frappe.session['user'], self.company))
+		warehouse = user_pos_setting[0][1] if user_pos_setting else None
+
+		if not warehouse:
+			global_pos_setting = frappe.db.sql("""select name, warehouse from `tabPOS Setting`
 				where ifnull(user,'') = '' and company = %s""", self.company)
-			if not ps:
+
+			if global_pos_setting:
+				warehouse = global_pos_setting[0][1]
+			elif not user_pos_setting:
 				msgprint(_("POS Setting required to make POS Entry"), raise_exception=True)
-			elif not ps[0][1]:
-				msgprint(_("Warehouse required in POS Setting"))
-			else:
-				w = ps[0][1]
-		return w
+
+		return warehouse
 
 	def on_update(self):
 		if cint(self.update_stock) == 1:
diff --git a/erpnext/stock/doctype/serial_no/serial_no.json b/erpnext/stock/doctype/serial_no/serial_no.json
index 3316582e0d9..8de04f03b43 100644
--- a/erpnext/stock/doctype/serial_no/serial_no.json
+++ b/erpnext/stock/doctype/serial_no/serial_no.json
@@ -155,7 +155,7 @@
    "fieldtype": "Select", 
    "label": "Creation Document Type", 
    "no_copy": 1, 
-   "options": "\nPurchase Receipt\nStock Entry", 
+   "options": "\nPurchase Receipt\nStock Entry\nSerial No", 
    "permlevel": 0, 
    "read_only": 1
   }, 
@@ -418,7 +418,7 @@
  "icon": "icon-barcode", 
  "idx": 1, 
  "in_create": 0, 
- "modified": "2014-05-27 03:49:19.131746", 
+ "modified": "2014-06-26 12:33:49.911829", 
  "modified_by": "Administrator", 
  "module": "Stock", 
  "name": "Serial No",