`BR-Z-10`

EN 16931 · validation rule

EN 16931Error

The VAT breakdown with category Z (Zero rated) carries a VAT exemption reason code (BT-121) or text (BT-120), which is not allowed for this category. The sender must remove cac:TaxCategory/cbc:TaxExemptionReasonCode and cbc:TaxExemptionReason / ram:ExemptionReasonCode and ram:ExemptionReason, or change the category to E, AE, K, G or O if the supply really is exempt.

Field: tax_breakdown[].exemption_reason (BT-120/BT-121)
Rule set: EN 16931
Rule-set version: EN 16931 validation artefacts 1.3.17 · in force since 2026-10-13 · Rule-set changelog
Who has to fix it: The sender

This is a property of the file you received, so it cannot be corrected on your side without changing the document — ask the supplier to reissue it.

Check your own invoice

Drop the file that failed. We parse it, run the official rule sets against it and list every finding with a fix — 20 invoices per day, no key, nothing stored.

Open the live demo

Same explanation over the API: GET /v1/rules/BR-Z-10?lang=en