diff --git a/erpnext/accounts/doctype/account/account.js b/erpnext/accounts/doctype/account/account.js
index 471fe7e..e39d77b 100644
--- a/erpnext/accounts/doctype/account/account.js
+++ b/erpnext/accounts/doctype/account/account.js
@@ -54,7 +54,6 @@
 cur_frm.cscript.account_type = function(doc, cdt, cdn) {
 	if(doc.group_or_ledger=='Ledger') {
 		cur_frm.toggle_display(['tax_rate'], doc.account_type == 'Tax');
-		cur_frm.toggle_display('master_type', cstr(doc.account_type)=='');
 		cur_frm.toggle_display('master_name', doc.account_type=='Warehouse' ||
 			in_list(['Customer', 'Supplier'], doc.master_type));
 	}
diff --git a/erpnext/accounts/doctype/account/account.py b/erpnext/accounts/doctype/account/account.py
index b1edaf4..014dde5 100644
--- a/erpnext/accounts/doctype/account/account.py
+++ b/erpnext/accounts/doctype/account/account.py
@@ -11,8 +11,9 @@
 	nsm_parent_field = 'parent_account'
 
 	def onload(self):
-		frozen_accounts_modifier = frappe.db.get_value("Accounts Settings", "Accounts Settings", "frozen_accounts_modifier")
-		if frozen_accounts_modifier in frappe.user.get_roles():
+		frozen_accounts_modifier = frappe.db.get_value("Accounts Settings", "Accounts Settings",
+			"frozen_accounts_modifier")
+		if not frozen_accounts_modifier or frozen_accounts_modifier in frappe.user.get_roles():
 			self.get("__onload").can_freeze_account = True
 
 
diff --git a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
index 348543e..262ac22 100644
--- a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
+++ b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
@@ -383,20 +383,20 @@
 
 
 	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:
@@ -747,7 +747,7 @@
 			'doctype'		:	'Sales Invoice',
 			'name'			:	inv,
 			'description'	:	msg,
-			'priority'		:	'Urgent'
+			'priority'		:	'High'
 		}
 		assign_to.add(args)
 
diff --git a/erpnext/controllers/stock_controller.py b/erpnext/controllers/stock_controller.py
index 83cec98..bb3ab69 100644
--- a/erpnext/controllers/stock_controller.py
+++ b/erpnext/controllers/stock_controller.py
@@ -238,7 +238,11 @@
 			frappe.throw(_("Expense or Difference account is mandatory for Item {0} as it impacts overall stock value").format(item.item_code))
 
 		else:
-			is_expense_account = frappe.db.get_value("Account", item.get("expense_account"), "report_type")=="Profit and Loss"
+			is_expense_account = frappe.db.get_value("Account",
+				item.get("expense_account"), "report_type")=="Profit and Loss"
+			if self.doctype != "Purchase Receipt" and not is_expense_account:
+				frappe.throw(_("Expense / Difference account ({0}) must be a 'Profit or Loss' account")
+					.format(item.get("expense_account")))
 			if is_expense_account and not item.get("cost_center"):
 				frappe.throw(_("{0} {1}: Cost Center is mandatory for Item {2}").format(
 					_(self.doctype), self.name, item.get("item_code")))
diff --git a/erpnext/manufacturing/doctype/production_planning_tool/production_planning_tool.py b/erpnext/manufacturing/doctype/production_planning_tool/production_planning_tool.py
index a59e0e9..e96dcbb 100644
--- a/erpnext/manufacturing/doctype/production_planning_tool/production_planning_tool.py
+++ b/erpnext/manufacturing/doctype/production_planning_tool/production_planning_tool.py
@@ -370,10 +370,8 @@
 		if items_to_be_requested:
 			for item in items_to_be_requested:
 				item_wrapper = frappe.get_doc("Item", item)
-				pr_doc = frappe.get_doc({
-					"doctype": "Material Request",
-					"__islocal": 1,
-					"naming_series": "IDT",
+				pr_doc = frappe.new_doc("Material Request")
+				pr_doc.update({
 					"transaction_date": nowdate(),
 					"status": "Draft",
 					"company": self.company,
diff --git a/erpnext/stock/doctype/serial_no/serial_no.json b/erpnext/stock/doctype/serial_no/serial_no.json
index 3316582..8de04f0 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",