diff --git a/accounts/doctype/accounts_settings/accounts_settings.py b/accounts/doctype/accounts_settings/accounts_settings.py
index a6e9938..2475fda 100644
--- a/accounts/doctype/accounts_settings/accounts_settings.py
+++ b/accounts/doctype/accounts_settings/accounts_settings.py
@@ -6,6 +6,7 @@
 from __future__ import unicode_literals
 import webnotes
 from webnotes import _
+from webnotes.utils import cint
 
 class DocType:
 	def __init__(self, d, dl):
@@ -14,7 +15,12 @@
 	def on_update(self):
 		webnotes.conn.set_default("auto_accounting_for_stock", self.doc.auto_accounting_for_stock)
 		
-		if self.doc.auto_accounting_for_stock:
+		if cint(self.doc.auto_accounting_for_stock):
+			# set default perpetual account in company
+			for company in webnotes.conn.sql("select name from tabCompany"):
+				webnotes.bean("Company", company[0]).save()
+			
+			# Create account head for warehouses
 			warehouse_list = webnotes.conn.sql("select name, company from tabWarehouse", as_dict=1)
 			warehouse_with_no_company = [d.name for d in warehouse_list if not d.company]
 			if warehouse_with_no_company:
diff --git a/accounts/doctype/purchase_invoice/purchase_invoice.py b/accounts/doctype/purchase_invoice/purchase_invoice.py
index 06b7a3a..fcd6846 100644
--- a/accounts/doctype/purchase_invoice/purchase_invoice.py
+++ b/accounts/doctype/purchase_invoice/purchase_invoice.py
@@ -302,6 +302,7 @@
 		self.make_gl_entries()
 		self.update_against_document_in_jv()
 		self.update_prevdoc_status()
+		self.update_billing_status_for_zero_amount_refdoc("Purchase Order")
 
 	def make_gl_entries(self):
 		auto_accounting_for_stock = \
@@ -421,7 +422,7 @@
 		remove_against_link_from_jv(self.doc.doctype, self.doc.name, "against_voucher")
 		
 		self.update_prevdoc_status()
-		
+		self.update_billing_status_for_zero_amount_refdoc("Purchase Order")
 		self.make_cancel_gl_entries()
 		
 	def on_update(self):
diff --git a/accounts/doctype/sales_invoice/sales_invoice.py b/accounts/doctype/sales_invoice/sales_invoice.py
index bfba30f..a39702b 100644
--- a/accounts/doctype/sales_invoice/sales_invoice.py
+++ b/accounts/doctype/sales_invoice/sales_invoice.py
@@ -88,6 +88,7 @@
 		
 		self.update_status_updater_args()
 		self.update_prevdoc_status()
+		self.update_billing_status_for_zero_amount_refdoc("Sales Order")
 		
 		# this sequence because outstanding may get -ve
 		self.make_gl_entries()
@@ -114,6 +115,7 @@
 
 		self.update_status_updater_args()
 		self.update_prevdoc_status()
+		self.update_billing_status_for_zero_amount_refdoc("Sales Order")
 		
 		self.make_cancel_gl_entries()
 		
diff --git a/controllers/status_updater.py b/controllers/status_updater.py
index a285c47..1743887 100644
--- a/controllers/status_updater.py
+++ b/controllers/status_updater.py
@@ -232,6 +232,43 @@
 								'Fully %(keyword)s', 'Partly %(keyword)s'))
 							where name='%(name)s'""" % args)
 							
+							
+	def update_billing_status_for_zero_amount_refdoc(self, ref_dt):
+		ref_fieldname = ref_dt.lower().replace(" ", "_")
+		zero_amount_refdoc = []
+		all_zero_amount_refdoc = webnotes.conn.sql_list("""select name from `tab%s` 
+			where docstatus=1 and net_total = 0""" % ref_dt)
+	
+		for item in self.doclist.get({"parentfield": "entries"}):
+			if item.fields.get(ref_fieldname) \
+				and item.fields.get(ref_fieldname) in all_zero_amount_refdoc \
+				and item.fields.get(ref_fieldname) not in zero_amount_refdoc:
+					zero_amount_refdoc.append(item.fields[ref_fieldname])
+		
+		if zero_amount_refdoc:
+			self.update_biling_status(zero_amount_refdoc, ref_dt, ref_fieldname)
+	
+	def update_biling_status(self, zero_amount_refdoc, ref_dt, ref_fieldname):
+		for ref_dn in zero_amount_refdoc:
+			ref_doc_qty = flt(webnotes.conn.sql("""select sum(ifnull(qty, 0)) from `tab%s Item` 
+				where parent=%s""" % (ref_dt, '%s'), (ref_dn))[0][0])
+			
+			billed_qty = flt(webnotes.conn.sql("""select sum(ifnull(qty, 0)) 
+				from `tab%s Item` where %s=%s and docstatus=1""" % 
+				(self.doc.doctype, ref_fieldname, '%s'), (ref_dn))[0][0])
+			
+			per_billed = ((ref_doc_qty if billed_qty > ref_doc_qty else billed_qty)\
+				/ ref_doc_qty)*100
+			webnotes.conn.set_value(ref_dt, ref_dn, "per_billed", per_billed)
+			
+			from webnotes.model.meta import has_field
+			if has_field(ref_dt, "billing_status"):
+				if per_billed < 0.001: billing_status = "Not Billed"
+				elif per_billed >= 99.99: billing_status = "Fully Billed"
+				else: billing_status = "Partly Billed"
+			
+				webnotes.conn.set_value(ref_dt, ref_dn, "billing_status", billing_status)
+							
 def get_tolerance_for(item_code, item_tolerance={}, global_tolerance=None):
 	"""
 		Returns the tolerance for the item, if not set, returns global tolerance