Added a reference of Sales Invoice in Serial No (#8855)
* [enhance] added Sales Invoice reference in Serial Number
* [patch] added test cases for Sales Invoice and added patch to copy sales invoice
* [minor] minor fixes in validate_serial_against_delivery_note
* [minor] fixes in sales invoice serial number validation
diff --git a/erpnext/patches.txt b/erpnext/patches.txt
index ac91f60..0faf98e 100644
--- a/erpnext/patches.txt
+++ b/erpnext/patches.txt
@@ -396,3 +396,4 @@
erpnext.patches.v8_0.rename_total_margin_to_rate_with_margin # 11-05-2017
erpnext.patches.v8_0.fix_status_for_invoices_with_negative_outstanding
erpnext.patches.v8_0.make_payments_table_blank_for_non_pos_invoice
+erpnext.patches.v8_0.set_sales_invoice_serial_number_from_delivery_note
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