[bean] [mandatory] fixes in test cases

buying/doctype/purchase_order/test_purchase_order.py

@@ -55,6 +55,7 @@ class TestPurchaseOrder(unittest.TestCase):
 		self.assertEquals(pi[0]["doctype"], "Purchase Invoice")
 		self.assertEquals(len(pi), len(test_records[0]))
 
+		pi[0].bill_no = "NA"
 		webnotes.bean(pi).insert()
 		
 	def test_subcontracting(self):

buying/doctype/supplier_quotation/test_supplier_quotation.py

@@ -39,8 +39,8 @@ class TestPurchaseOrder(unittest.TestCase):
 		po[0]["naming_series"] = "_T-Purchase Order-"
 
 		for doc in po:
-			if doc.parentfield=="purchase_order_items":
-				doc.schedule_date = "2013-04-12"
+			if doc.get("item_code"):
+				doc["schedule_date"] = "2013-04-12"
 
 		webnotes.bean(po).insert()