diff --git a/erpnext/__init__.py b/erpnext/__init__.py
index ba5a8c1bce4..a9aa5ae60e5 100644
--- a/erpnext/__init__.py
+++ b/erpnext/__init__.py
@@ -5,7 +5,7 @@ import frappe
 from erpnext.hooks import regional_overrides
 from frappe.utils import getdate
 
-__version__ = '10.1.67'
+__version__ = '10.1.68'
 
 def get_default_company(user=None):
 	'''Get default company for user'''
diff --git a/erpnext/accounts/report/financial_statements.py b/erpnext/accounts/report/financial_statements.py
index fde0737fd37..e7f7b08672b 100644
--- a/erpnext/accounts/report/financial_statements.py
+++ b/erpnext/accounts/report/financial_statements.py
@@ -1,7 +1,9 @@
+# -*- coding: utf-8 -*-
+
 # Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
 # License: GNU General Public License v3. See license.txt
 
-
+from __future__ import unicode_literals
 
 import re
 from past.builtins import cmp
@@ -342,7 +344,7 @@ def set_gl_entries_by_account(
 	accounts = frappe.db.sql_list("""select name from `tabAccount`
 		where lft >= %s and rgt <= %s""", (root_lft, root_rgt))
 	additional_conditions += " and account in ({})"\
-		.format(", ".join([frappe.safe_encode(frappe.db.escape(d)) for d in accounts]))
+		.format(", ".join([frappe.db.escape(d) for d in accounts]))
 
 	gl_entries = frappe.db.sql("""select posting_date, account, debit, credit, is_opening, fiscal_year, debit_in_account_currency, credit_in_account_currency, account_currency from `tabGL Entry`
 		where company=%(company)s
@@ -400,7 +402,6 @@ def get_additional_conditions(from_date, ignore_closing_entries, filters):
 
 def get_cost_centers_with_children(cost_centers):
 	if not isinstance(cost_centers, list):
-		cost_centers = frappe.safe_encode(cost_centers)
 		cost_centers = [d.strip() for d in cost_centers.strip().split(',') if d]
 
 	all_cost_centers = []
diff --git a/erpnext/assets/doctype/asset/asset.py b/erpnext/assets/doctype/asset/asset.py
index 69977767017..a38b40bc60b 100644
--- a/erpnext/assets/doctype/asset/asset.py
+++ b/erpnext/assets/doctype/asset/asset.py
@@ -85,8 +85,17 @@ class Asset(AccountsController):
 		elif not self.finance_books:
 			frappe.throw(_("Enter depreciation details"))
 
-		if self.available_for_use_date and getdate(self.available_for_use_date) < getdate(nowdate()):
-			frappe.throw(_("Available-for-use Date is entered as past date"))
+		if self.is_existing_asset:
+			return
+
+		date =  nowdate()
+		docname = self.purchase_receipt or self.purchase_invoice
+		if docname:
+			doctype = 'Purchase Receipt' if self.purchase_receipt else 'Purchase Invoice'
+			date = frappe.db.get_value(doctype, docname, 'posting_date')
+
+		if self.available_for_use_date and getdate(self.available_for_use_date) < getdate(date):
+			frappe.throw(_("Available-for-use Date should be after purchase date"))
 
 	def make_depreciation_schedule(self):
 		if self.depreciation_method != 'Manual':
diff --git a/erpnext/hooks.py b/erpnext/hooks.py
index e421a4cfcea..47a7044bb48 100644
--- a/erpnext/hooks.py
+++ b/erpnext/hooks.py
@@ -12,7 +12,7 @@ app_license = "GNU General Public License (v3)"
 source_link = "https://github.com/frappe/erpnext"
 
 develop_version = '12.x.x-develop'
-staging_version = '11.0.3-beta.18'
+staging_version = '11.0.3-beta.19'
 
 error_report_email = "support@erpnext.com"
 
diff --git a/erpnext/patches/v11_0/update_department_lft_rgt.py b/erpnext/patches/v11_0/update_department_lft_rgt.py
index 5a8837ee2c3..b2f407b18ef 100644
--- a/erpnext/patches/v11_0/update_department_lft_rgt.py
+++ b/erpnext/patches/v11_0/update_department_lft_rgt.py
@@ -1,3 +1,5 @@
+from __future__ import unicode_literals
+
 import frappe
 from frappe import _
 from frappe.utils.nestedset import rebuild_tree
diff --git a/erpnext/stock/doctype/serial_no/serial_no.py b/erpnext/stock/doctype/serial_no/serial_no.py
index 4b1ceed7e5e..d070af05c88 100644
--- a/erpnext/stock/doctype/serial_no/serial_no.py
+++ b/erpnext/stock/doctype/serial_no/serial_no.py
@@ -85,9 +85,9 @@ class SerialNo(StockController):
 			self.purchase_date = purchase_sle.posting_date
 			self.purchase_time = purchase_sle.posting_time
 			self.purchase_rate = purchase_sle.incoming_rate
-			if purchase_sle.voucher_type == "Purchase Receipt":
+			if purchase_sle.voucher_type in ("Purchase Receipt", "Purchase Invoice"):
 				self.supplier, self.supplier_name = \
-					frappe.db.get_value("Purchase Receipt", purchase_sle.voucher_no,
+					frappe.db.get_value(purchase_sle.voucher_type, purchase_sle.voucher_no,
 						["supplier", "supplier_name"])
 
 			# If sales return entry
@@ -304,8 +304,8 @@ def has_duplicate_serial_no(sn, sle):
 
 	status = False
 	if sn.purchase_document_no:
-		if sle.voucher_type in ['Purchase Receipt', 'Stock Entry'] and \
-			sn.delivery_document_type not in ['Purchase Receipt', 'Stock Entry']:
+		if sle.voucher_type in ['Purchase Receipt', 'Stock Entry', "Purchase Invoice"] and \
+			sn.delivery_document_type not in ['Purchase Receipt', 'Stock Entry', "Purchase Invoice"]:
 			status = True
 
 		if status and sle.voucher_type == 'Stock Entry' and \