The latest articles on DEV Community by Michael Sathya Gorski (@michaelgorski). https://dev.to/michaelgorski https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F4077495%2F5d846cf1-5d92-4f91-9b7e-3c04e35d528e.jpg https://dev.to/michaelgorski en Michael Sathya Gorski Fri, 14 Aug 2026 10:17:22 +0000 https://dev.to/michaelgorski/br-de-15-is-not-a-schematron-mystery-45ef https://dev.to/michaelgorski/br-de-15-is-not-a-schematron-mystery-45ef <p>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 that field is the Leitweg-ID.</p> <p>Typical log:<br> </p> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code>[error] BR-DE-15 | XRechnung_3.0 | severity=fatal </code></pre> </div> <p>What you actually need to set is <code>invoice.buyer_reference</code>. B2G: <code>04011000-1234512345-06</code>. B2B: whatever you agreed with the buyer.</p> <p>I mapped the KoSIT rules onto the JSON fields we send, so the 422 names the path instead of the XPath. The BR-DE-15 page is here: <a href="https://normbill.com/docs/rules/br-de-15" rel="noopener noreferrer">https://normbill.com/docs/rules/br-de-15</a></p> <p>Same report, no account, if you just want to drop XML: <a href="https://normbill.com/validator" rel="noopener noreferrer">https://normbill.com/validator</a></p> xrechnung en16931 php germany