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Critical

SCHEMA-003

Mandatory Element Cardinality Violated

What This Error Means

One or more mandatory elements required by the UBL 2.1 XSD schema are either missing or appear more than once when the cardinality is [1..1]. This error fires before Schematron rules and typically indicates a structural generation bug in invoicing software.

How to Fix It

Validate against the UBL 2.1 Invoice schema (UBL-Invoice-2.1.xsd). Check that all [1..1] and [1..n] elements are present exactly once. Common missing elements: cbc:CustomizationID, cbc:ProfileID, cbc:InvoiceTypeCode.

XML Example
<!-- Required identification elements -->
<cbc:CustomizationID>urn:cen.eu:en16931:2017#compliant#urn:xoev-de:kosit:standard:xrechnung_3.0</cbc:CustomizationID>
<cbc:ProfileID>urn:fdc:peppol.eu:2017:poacc:billing:01:1.0</cbc:ProfileID>
<cbc:ID>RE-2024-00123</cbc:ID>
<cbc:IssueDate>2024-07-15</cbc:IssueDate>
<cbc:InvoiceTypeCode>380</cbc:InvoiceTypeCode>

Fix Automatically

Upload your invoice to our Smart Repair engine. It will detect and fix SCHEMA-003 errors automatically with a GoBD audit trail.

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Related Errors

Other commonly encountered validation errors

BR-DE-1Seller VAT ID Missing (BT-31)BR-DE-2Buyer Reference Missing (BT-10)BR-DE-3Seller Contact Telephone Missing (BT-42)BR-DE-4Seller Contact Email Missing (BT-43)