diff --git a/erpnext/buying/doctype/purchase_order/purchase_order.py b/erpnext/buying/doctype/purchase_order/purchase_order.py
index 234c643..8f5c63d 100644
--- a/erpnext/buying/doctype/purchase_order/purchase_order.py
+++ b/erpnext/buying/doctype/purchase_order/purchase_order.py
@@ -162,7 +162,7 @@
 		clear_doctype_notifications(self)
 
 	def on_submit(self):
-		if self.drop_ship == 1:
+		if self.is_drop_ship == 1:
 			self.status_updater[0].update({
 				"target_parent_dt": "Sales Order",
 				"target_parent_field": "per_ordered",
@@ -184,7 +184,7 @@
 		purchase_controller.update_last_purchase_rate(self, is_submit = 1)
 
 	def on_cancel(self):
-		if self.drop_ship == 1:
+		if self.is_drop_ship == 1:
 			self.status_updater[0].update({
 				"target_parent_dt": "Sales Order",
 				"target_parent_field": "per_ordered",
diff --git a/erpnext/controllers/status_updater.py b/erpnext/controllers/status_updater.py
index 69e2d3e..0861f37 100644
--- a/erpnext/controllers/status_updater.py
+++ b/erpnext/controllers/status_updater.py
@@ -215,8 +215,8 @@
 		
 		args["drop_ship_cond"] = ''
 		
-		if getattr(self, "drop_ship", None):
-			if self.drop_ship == 1:
+		if getattr(self, "is_drop_ship", None):
+			if self.is_drop_ship == 1:
 				args["drop_ship_cond"] = " and is_drop_ship=1 "
 			
 		else:
diff --git a/erpnext/selling/doctype/sales_order/sales_order.py b/erpnext/selling/doctype/sales_order/sales_order.py
index 911f4b7..0e7ca96 100644
--- a/erpnext/selling/doctype/sales_order/sales_order.py
+++ b/erpnext/selling/doctype/sales_order/sales_order.py
@@ -500,7 +500,7 @@
 		target.contact_mobile = ""
 		target.contact_email = ""
 		target.contact_person = ""
-		target.drop_ship = 1
+		target.is_drop_ship = 1
 		target.run_method("set_missing_values")
 		target.run_method("calculate_taxes_and_totals")