The sales tax rate is currently set to 0% in the claim amount on the 1st page of a 0€ invoice, even though 19% is stated for the invoice. This is wrong and a big mistake for tax purposes, because, for example, in the case of a 0€ final invoice, 0% sales tax is shown on all previous payment invoices. The sales tax rate must be correctly stated even with a 0€ invoice.