Open and validate XRechnung
XRechnung is a structured e-invoice. The invoice data lives in an XML file, which a viewer can turn into a readable invoice.
As of
What you should know
XRechnung uses UBL or CII XML. Validate the original file. The validation report identifies the version and rules applied to it.
Sources
This information is for general guidance. For legal or tax advice, consult a qualified adviser.