diff --git a/erpnext/stock/doctype/purchase_receipt/test_purchase_receipt.py b/erpnext/stock/doctype/purchase_receipt/test_purchase_receipt.py
index 9b8eeed1a12..5921651feca 100644
--- a/erpnext/stock/doctype/purchase_receipt/test_purchase_receipt.py
+++ b/erpnext/stock/doctype/purchase_receipt/test_purchase_receipt.py
@@ -527,7 +527,7 @@ class TestPurchaseReceipt(unittest.TestCase):
 
 		se = make_stock_entry(item_code=item_code, target="_Test Warehouse - _TC", qty=1,
 			serial_no=serial_no, basic_rate=100, do_not_submit=True)
-		self.assertRaises(SerialNoDuplicateError, se.submit)
+		se.submit()
 
 	def test_auto_asset_creation(self):
 		asset_item = "Test Asset Item"
diff --git a/erpnext/stock/doctype/serial_no/serial_no.py b/erpnext/stock/doctype/serial_no/serial_no.py
index 25ce2d59695..86f3c1f5616 100644
--- a/erpnext/stock/doctype/serial_no/serial_no.py
+++ b/erpnext/stock/doctype/serial_no/serial_no.py
@@ -365,8 +365,8 @@ def has_serial_no_exists(sn, sle):
 			status = True
 
 		# If status is receipt then system will allow to in-ward the delivered serial no
-		if (status and sle.voucher_type == 'Stock Entry' and
-			frappe.db.get_value('Stock Entry', sle.voucher_no, 'purpose') == 'Material Receipt'):
+		if (status and sle.voucher_type == "Stock Entry" and frappe.db.get_value("Stock Entry",
+			sle.voucher_no, "purpose") in ("Material Receipt", "Material Transfer")):
 			status = False
 
 	return status