# EHF-REMINDER-B19501

Source: https://xmlvalid.com/rules/EHF-REMINDER-B19501

> Value MUST be part of code list 'Recommendation 20, including Recommendation 21 codes - prefixed with X (UN/ECE)' or 'Recommandation 21 (UN/ECE)'.

- Level: error
- Rule sets: EHF Reminder 3.0 rules (Norway) release 2026-09-29
- Context: `/ubl:Invoice/cac:InvoiceLine/cac:Price/cbc:BaseQuantity`
- Test: `not(@unitCode) or (some $code in $clUNECERec20 satisfies $code = @unitCode) or (some $code in $clUNECERec21 satisfies $code = @unitCode)`

Validate a document against these rules: https://xmlvalid.com/validate