Invoice numbers and invoice dates

Since you are just starting up, I wouldn't make a big deal out of it. You can provide an explanation to the auditor on how this happened. Just don't do it again in the future ;-). Invoice dates and numbers must be sequential in order to prevent invoices from 'disappearing'. If you use Dexxter to create your invoices in the future, this should no longer be a problem.

Thank you for your response!

In future, I will keep better track of the invoices and enter them more often, rather than waiting until the vAT declaration is due.