We have a serious issue with Credit notes not updating stock for invoices that were done on service orders.

If I open an invoice that has been completed for a service order and click on Operations >> Create credit note >> Then ok the credit note, the items are not returned into stock even though the "Update stock" block is ticked on the invoice under Del. Terms.

On the work sheet there is an option to return stock. This option updates the stock with the return, so why not with a Credit Note from a Service Order Invoice?