When signing up for Mantis, I get "APPLICATION ERROR #1904: Confirmation hash does not match. Please retry.", so I'll report this here:
When generating a delivery note, the delivery note appears to be numbered wrong. The delivery note I recently generated are numbered "4" on the delivery note, while the invoice points to delivery note "5". In the system, the delivery note # value is 5 (which is referred to as the delivery note number in the invoice), while the delivery note ref. value is 4 (which is printed on the delivery note).