Without the CustomizationID (BT-24) the profile (XRechnung, Factur-X …) cannot be determined.
Set the URN matching the target specification, e.g. urn:cen.eu:en16931:2017#compliant#urn:xeinkauf.de:kosit:xrechnung_3.0.
The Billhorse validator checks XRechnung, ZUGFeRD and Factur-X right in your browser — your file is never uploaded.
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Rule source: EN 16931 / XRechnung (KOSIT) or Billhorse check (BH-*).
