Test case fixes for serial no
diff --git a/erpnext/stock/doctype/stock_entry/test_stock_entry.py b/erpnext/stock/doctype/stock_entry/test_stock_entry.py
index 4739d21..fc60fce 100644
--- a/erpnext/stock/doctype/stock_entry/test_stock_entry.py
+++ b/erpnext/stock/doctype/stock_entry/test_stock_entry.py
@@ -256,7 +256,7 @@
 
 		# insert a pos invoice with update stock
 		si = frappe.copy_doc(sales_invoice_test_records[1])
-		si.is_pos = si.update_stock = 1
+		si.update_stock = 1
 		si.get("entries")[0].warehouse = "_Test Warehouse - _TC"
 		si.get("entries")[0].item_code = item_code
 		si.get("entries")[0].qty = 5.0
@@ -663,6 +663,7 @@
 
 	def test_serial_no_not_exists(self):
 		self._clear_stock_account_balance()
+		frappe.db.sql("delete from `tabSerial No` where name in ('ABCD', 'EFGH')")
 		se = frappe.copy_doc(test_records[0])
 		se.purpose = "Material Issue"
 		se.get("mtn_details")[0].item_code = "_Test Serialized Item"
@@ -823,8 +824,6 @@
 	se.submit()
 	return se
 
-test_records = frappe.get_test_records('Stock Entry')
-
 def make_stock_entry(item, source, target, qty, incoming_rate=None):
 	s = frappe.new_doc("Stock Entry")
 	if source and target:
@@ -845,3 +844,5 @@
 	s.insert()
 	s.submit()
 	return s
+
+test_records = frappe.get_test_records('Stock Entry')