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Technical guides, engineering notes and practical references from the systems we are building at Ironfang.

Illustration of a UBL invoice being checked against EN 16931 validation rules, with XML code, rule results, and error indicators.

Peppol

Understanding EN 16931 Validation Errors

EN 16931 validation errors look cryptic until you know what the rule IDs, business terms and VAT rule families actually mean. Here's how to read them and work out what your invoice is doing wrong.

12 min read