Credit note
Is a credit note the same as canceling an invoice?
Short answer
Nope. A credit note is a separate document that corrects the tax base and tax on an already existing invoice; the original invoice remains a valid archived document, only its value is adjusted by a credit note.
Conclusion
FAQ of the Financial Administration of the Slovak Republic on e-invoice · OpenPeppol BIS Billing 3.0 — repeatable reference to previous invoices
Not legal advice. Machine-translated answer, not yet manually reviewed. For the exact wording, see the Slovak original.