diff --git a/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py b/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py
index 12934a1..d916b61 100644
--- a/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py
+++ b/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py
@@ -150,10 +150,14 @@
 		against_accounts = []
 		stock_items = self.get_stock_items()
 		for item in self.get("items"):
+			# in case of auto inventory accounting, 
+			# against expense account is always "Stock Received But Not Billed"
+			# for a stock item and if not epening entry and not drop-ship entry
+			
 			if auto_accounting_for_stock and item.item_code in stock_items \
-					and self.is_opening == 'No':
-				# in case of auto inventory accounting, against expense account is always
-				# Stock Received But Not Billed for a stock item
+				and self.is_opening == 'No' and (not item.po_detail or 
+					not frappe.db.get_value("Purchase Order Item", item.po_detail, "delivered_by_supplier")):
+				
 				item.expense_account = stock_not_billed_account
 				item.cost_center = None
 
diff --git a/erpnext/buying/doctype/purchase_order/purchase_order.js b/erpnext/buying/doctype/purchase_order/purchase_order.js
index 9ee8062..f1179ee 100644
--- a/erpnext/buying/doctype/purchase_order/purchase_order.js
+++ b/erpnext/buying/doctype/purchase_order/purchase_order.js
@@ -47,14 +47,14 @@
 				cur_frm.add_custom_button(__('Close'), this.close_purchase_order);
 			}
 
-			if(is_drop_ship && doc.status!="Delivered"){
-				cur_frm.add_custom_button(__('Mark as Delivered'), this.delivered_by_supplier);
-			}
-
 			if(flt(doc.per_billed)==0) {
 				cur_frm.add_custom_button(__('Payment'), cur_frm.cscript.make_bank_entry);
 			}
-
+			
+			if(is_drop_ship && doc.status!="Delivered"){
+				cur_frm.add_custom_button(__('Mark as Delivered'),
+					 this.delivered_by_supplier).addClass("btn-primary");
+			}
 		} else if(doc.docstatus===0) {
 			cur_frm.cscript.add_from_mappers();
 		} 
@@ -70,12 +70,13 @@
 			}
 
 			if(flt(doc.per_billed, 2) < 100)
-				cur_frm.add_custom_button(__('Invoice'), this.make_purchase_invoice);	
+				cur_frm.add_custom_button(__('Invoice'), 
+					this.make_purchase_invoice).addClass("btn-primary");	
 		}
 		
 		if(doc.docstatus == 1 && in_list(["Stopped", "Closed", "Delivered"], doc.status)) {
 			if (this.frm.has_perm("submit")) {
-				cur_frm.add_custom_button(__('Re-open'), this.unstop_purchase_order);
+				cur_frm.add_custom_button(__('Re-open'), this.unstop_purchase_order).addClass("btn-primary");
 			}
 		}
 	},
diff --git a/erpnext/buying/doctype/purchase_order/purchase_order.json b/erpnext/buying/doctype/purchase_order/purchase_order.json
index bd3f6fb..e52081b 100644
--- a/erpnext/buying/doctype/purchase_order/purchase_order.json
+++ b/erpnext/buying/doctype/purchase_order/purchase_order.json
@@ -418,29 +418,6 @@
    "allow_on_submit": 0, 
    "bold": 0, 
    "collapsible": 0, 
-   "fieldname": "delivered_by_supplier", 
-   "fieldtype": "Check", 
-   "hidden": 0, 
-   "ignore_user_permissions": 0, 
-   "in_filter": 0, 
-   "in_list_view": 0, 
-   "label": "To be delivered to customer", 
-   "length": 0, 
-   "no_copy": 0, 
-   "permlevel": 0, 
-   "precision": "", 
-   "print_hide": 1, 
-   "read_only": 1, 
-   "report_hide": 0, 
-   "reqd": 0, 
-   "search_index": 0, 
-   "set_only_once": 0, 
-   "unique": 0
-  }, 
-  {
-   "allow_on_submit": 0, 
-   "bold": 0, 
-   "collapsible": 0, 
    "fieldname": "column_break_19", 
    "fieldtype": "Column Break", 
    "hidden": 0, 
@@ -2406,7 +2383,7 @@
  "issingle": 0, 
  "istable": 0, 
  "max_attachments": 0, 
- "modified": "2015-11-20 15:51:09.314885", 
+ "modified": "2015-11-20 15:51:09.314888", 
  "modified_by": "Administrator", 
  "module": "Buying", 
  "name": "Purchase Order", 
diff --git a/erpnext/buying/doctype/purchase_order/purchase_order.py b/erpnext/buying/doctype/purchase_order/purchase_order.py
index 2f155d2..1212899 100644
--- a/erpnext/buying/doctype/purchase_order/purchase_order.py
+++ b/erpnext/buying/doctype/purchase_order/purchase_order.py
@@ -48,7 +48,7 @@
 		self.validate_for_subcontracting()
 		self.validate_minimum_order_qty()
 		self.create_raw_materials_supplied("supplied_items")
-		self.set_received_qty_and_billed_amount_for_drop_ship_items()
+		self.set_received_qty_for_drop_ship_items()
 
 	def validate_with_previous_doc(self):
 		super(PurchaseOrder, self).validate_with_previous_doc({
@@ -253,11 +253,10 @@
 		
 		return is_drop_ship
 	
-	def set_received_qty_and_billed_amount_for_drop_ship_items(self):
+	def set_received_qty_for_drop_ship_items(self):
 		for item in self.items:
 			if item.delivered_by_supplier == 1:
 				item.received_qty = item.qty
-				item.billed_amt = item.amount
 
 @frappe.whitelist()
 def stop_or_unstop_purchase_orders(names, status):
@@ -342,7 +341,7 @@
 				"parent": "purchase_order",
 			},
 			"postprocess": update_item,
-			"condition": lambda doc: (doc.base_amount==0 or doc.billed_amt < doc.amount) and doc.delivered_by_supplier!=1
+			"condition": lambda doc: (doc.base_amount==0 or doc.billed_amt < doc.amount)
 		},
 		"Purchase Taxes and Charges": {
 			"doctype": "Purchase Taxes and Charges",
diff --git a/erpnext/patches.txt b/erpnext/patches.txt
index 3675924..aa57ba3 100644
--- a/erpnext/patches.txt
+++ b/erpnext/patches.txt
@@ -237,3 +237,4 @@
 erpnext.patches.v6_10.fix_ordered_received_billed
 erpnext.patches.v6_10.fix_jv_total_amount #2015-11-28
 erpnext.patches.v6_10.email_digest_default_quote
+erpnext.patches.v6_10.fix_billed_amount_in_drop_ship_po
\ No newline at end of file
diff --git a/erpnext/patches/v6_10/fix_billed_amount_in_drop_ship_po.py b/erpnext/patches/v6_10/fix_billed_amount_in_drop_ship_po.py
new file mode 100644
index 0000000..4aecaa7
--- /dev/null
+++ b/erpnext/patches/v6_10/fix_billed_amount_in_drop_ship_po.py
@@ -0,0 +1,18 @@
+from __future__ import unicode_literals
+import frappe
+
+def execute():
+	frappe.db.sql("""update `tabPurchase Order Item` set billed_amt = 0
+			where delivered_by_supplier=1 and docstatus=1""")
+			
+	drop_ship_pos = frappe.db.sql("""select distinct parent from `tabPurchase Order Item` 
+		where delivered_by_supplier=1 and docstatus=1""")
+		
+	for po in drop_ship_pos:
+		invoices = frappe.db.sql("""select distinct parent from `tabPurchase Invoice Item`
+			where purchase_order=%s and docstatus=1""", po[0])
+		if invoices:
+			for inv in invoices:
+				frappe.get_doc("Purchase Invoice", inv[0]).update_qty(change_modified=False)
+		else:
+			frappe.db.sql("""update `tabPurchase Order` set per_billed=0 where name=%s""", po[0])
\ No newline at end of file