BR-DE-15 is not a Schematron mystery
If you generate XRechnung and KoSIT dies on BR-DE-15, it is not a broken validator. The buyer reference (BT-10) is missing. For German public buyers…
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Why a Rendered Invoice Can Still Fail Send
An invoice PDF can exist and still not be an invoice package. That sentence shaped the send path. The easy implementation would render the invoice,…
How to validate Peppol BIS 3 invoices in 5 lines of Python (or Node, or Go)
Starting September 2026 every B2B invoice in France must be e-invoiced (Peppol/Factur-X). Germany has mandated XRechnung for B2G since 2020. Italy h…