I update ERPnext software constantly and now at ERPNext V13.10.2 and Frappe V13.10.0. I realised that Barcode in Sales Invoice can not be used. The error message “Cannot find Item with this Barcode” will appear when first digit of barcode is entered.
For my case, we bypass sales order, packing and delivery note procedure. we issue invoice directly to customer. [FYI, bar code in sales order is also not working, the same message will appear]
Please note that the barcode scanning was function well all the time till recent update.