Due to legal requirements, it is not possible to change or interrupt the invoice number sequence during an accounting year.

The invoice numbers must be an ascending number sequence.

You can, after account creation, define the invoice and customer numbers once. This applies to the initial number as well as the format. After the first import from the Jimdo store, this can then no longer be changed.

If you are in the testing phase, it is a good way to experiment with the settings. You can reset the account and test the settings until they best suit your business.

You can select "Reset account" under "Options" (top right after login). This option will delete all invoices and customers and restore the account to its original state (your personal data/settings will not be deleted).