When you create a new account in Zervant, you will find one example customer (called “Otto Normalverbaucher GmbH”) with fictional contact details, in the customer tab. The VAT number DE999999999 belongs to the fictional customer. If you create a test invoice addressing the example customer, you will see his fake VAT number DE999999999 on the upper right-hand side of the invoice.
DE999999999 therefore indicates where your real customer’s VAT number is shown on the invoice.
If you have entered your own VAT number (My account > Company contact information) it will be shown in the footnote of every invoice.
If you have entered your own VAT number (My account > Company contact information) it will be shown in the footnote of every invoice.