Hello Ricardo,

Thank you for your response. With the help of your tips, I was able to correct the faulty invoices. However, I haven't been able to determine the exact source of the errors yet.

In today's billing run, two invoices were incorrect:

One invoice, or its corresponding timesheet, had a booking without a sales order item.
In the other timesheet, everything seemed fine. However, I identified a booking line that was considered in the timesheet but not in the invoice. Without knowing the exact internals, I would say that the corresponding record was corrupt.
Before the next billing run, I will make sure to check all time entries in the Timesheets app more thoroughly. Alternatively, we might consider changing the process so that only approved time entries are invoiced. This way, I can correct any arising bookings directly.

Best regards,
Steffen