Storno invoice (sztornó)
A storno invoice is a document that cancels an invoice issued earlier; an issued invoice cannot be deleted or rewritten, only cancelled or corrected.
Updated:
Explanation
A storno is also reported to NAV and reverses the original invoice. If only one line is wrong, a corrective invoice may be the alternative.
The VAT Act has rules for documents that correct or cancel an invoice; which applies to your case is a question for your accountant.
How HelloTeam does it
In HelloTeam an issued invoice cannot be edited; it is reversed with a storno, which the invoicing provider issues and reports.
Module: Invoicing (€7.90 / month).
Sources
This is general information, not legal or tax advice. The rules come from: 2007. évi CXXVII. törvény az általános forgalmi adóról (Áfa tv.), Nemzeti Jogszabálytár (checked )