advance paid should not be copied and patch to fix affected records

erpnext/patches/v4_2/update_advance_paid.py

@@ -0,0 +1,13 @@
+# Copyright (c) 2013, Web Notes Technologies Pvt. Ltd. and Contributors
+# License: GNU General Public License v3. See license.txt
+
+from __future__ import unicode_literals
+import frappe
+
+def execute():
+	for dt in ("Sales Order", "Purchase Order"):
+		orders_with_advance = frappe.db.sql("""select name from `tab{0}` 
+			where docstatus < 2 and ifnull(advance_paid, 0) != 0""".format(dt), as_dict=1)
+			
+		for order in orders_with_advance:
+			frappe.get_doc(dt, order.name).set_total_advance_paid()