diff --git a/erpnext/buying/doctype/purchase_order/test_purchase_order.py b/erpnext/buying/doctype/purchase_order/test_purchase_order.py
index 3d6cba8..813286f 100644
--- a/erpnext/buying/doctype/purchase_order/test_purchase_order.py
+++ b/erpnext/buying/doctype/purchase_order/test_purchase_order.py
@@ -200,6 +200,7 @@
 		# add new item
 		trans_item = json.dumps([{'item_code' : '_Test Item', 'rate' : 100, 'qty' : 2}])
 		self.assertRaises(frappe.ValidationError, update_child_qty_rate,'Purchase Order', trans_item, po.name)
+		frappe.set_user("Administrator")
 
 	def test_update_qty(self):
 		po = create_purchase_order()
diff --git a/erpnext/controllers/accounts_controller.py b/erpnext/controllers/accounts_controller.py
index c75aff9..837ffe3 100644
--- a/erpnext/controllers/accounts_controller.py
+++ b/erpnext/controllers/accounts_controller.py
@@ -1234,7 +1234,7 @@
 			if parent_doctype == 'Sales Order':
 				prev_date, new_date = child_item.get("delivery_date"), d.get("delivery_date")
 			elif parent_doctype == 'Purchase Order':
-				prev_date, new_date = child_item.get("schedule_date") == d.get("schedule_date")
+				prev_date, new_date = child_item.get("schedule_date"), d.get("schedule_date")
 
 			rate_unchanged = prev_rate == new_rate
 			qty_unchanged = prev_qty == new_qty