diff --git a/stock/doctype/delivery_note/delivery_note.py b/stock/doctype/delivery_note/delivery_note.py
index e2f1333..8cd5756 100644
--- a/stock/doctype/delivery_note/delivery_note.py
+++ b/stock/doctype/delivery_note/delivery_note.py
@@ -400,6 +400,7 @@
 	def update_item(obj, target, source_parent):
 		target.qty = flt(obj.qty) - flt(obj.installed_qty)
 		target.prevdoc_date = source_parent.posting_date
+		target.serial_no = obj.serial_no
 	
 	doclist = get_mapped_doclist("Delivery Note", source_name, 	{
 		"Delivery Note": {