[hotfix] drop ship patch
diff --git a/erpnext/patches/v6_8/move_drop_ship_to_po_items.py b/erpnext/patches/v6_8/move_drop_ship_to_po_items.py
index c935831..1c2a57a 100644
--- a/erpnext/patches/v6_8/move_drop_ship_to_po_items.py
+++ b/erpnext/patches/v6_8/move_drop_ship_to_po_items.py
@@ -1,37 +1,39 @@
 import frappe
 
 def execute():
+	frappe.reload_doctype("Purchase Order")
 	frappe.reload_doctype("Purchase Order Item")
+
 	for po in frappe.get_all("Purchase Order", filters={"delivered_by_supplier": 1}, fields=["name"]):
 		purchase_order = frappe.get_doc("Purchase Order", po)
-		
+
 		for item in purchase_order.items:
 			if item.prevdoc_doctype == "Sales Order":
-				delivered_by_supplier = frappe.get_value("Sales Order Item", item.prevdoc_detail_docname, 
+				delivered_by_supplier = frappe.get_value("Sales Order Item", item.prevdoc_detail_docname,
 					"delivered_by_supplier")
-				
+
 				if delivered_by_supplier:
-					frappe.db.sql("""update `tabPurchase Order Item` 
+					frappe.db.sql("""update `tabPurchase Order Item`
 						set delivered_by_supplier=1, billed_amt=amount, received_qty=qty
 						where name=%s """, item.name)
-						
+
 		update_per_received(purchase_order)
 		update_per_billed(purchase_order)
-	
+
 def update_per_received(po):
-	frappe.db.sql(""" update `tabPurchase Order` 
-				set per_received = round((select sum(if(qty > ifnull(received_qty, 0), 
-					ifnull(received_qty, 0), qty)) / sum(qty) *100 
-				from `tabPurchase Order Item` 
-				where parent = %(name)s), 2) 
+	frappe.db.sql(""" update `tabPurchase Order`
+				set per_received = round((select sum(if(qty > ifnull(received_qty, 0),
+					ifnull(received_qty, 0), qty)) / sum(qty) *100
+				from `tabPurchase Order Item`
+				where parent = %(name)s), 2)
 			where name = %(name)s """, {"name": po.name})
 
 def update_per_billed(po):
-	frappe.db.sql(""" update `tabPurchase Order` 
-				set per_billed = round((select sum( if(amount > ifnull(billed_amt, 0), 
-					ifnull(billed_amt, 0), amount)) / sum(amount) *100 
-				from `tabPurchase Order Item` 
-				where parent = %(name)s), 2) 
+	frappe.db.sql(""" update `tabPurchase Order`
+				set per_billed = round((select sum( if(amount > ifnull(billed_amt, 0),
+					ifnull(billed_amt, 0), amount)) / sum(amount) *100
+				from `tabPurchase Order Item`
+				where parent = %(name)s), 2)
 			where name = %(name)s """, {"name": po.name})
 
-				
+