fix(stock): ignore packing slip while cancelling the sales invoice

Author: Sudharsanan11

erpnext/accounts/doctype/sales_invoice/sales_invoice.js

@@ -44,6 +44,7 @@ erpnext.accounts.SalesInvoiceController = class SalesInvoiceController extends (
 			"Unreconcile Payment Entries",
 			"Serial and Batch Bundle",
 			"Bank Transaction",
+			"Packing Slip",
 		];
 
 		if (!this.frm.doc.__islocal && !this.frm.doc.customer && this.frm.doc.debit_to) {