# DT-CIUS-PT-114.2

Source: https://xmlvalid.com/rules/DT-CIUS-PT-114.2

> The BT-126 value must be unique.

- Level: error
- Rule sets: CIUS-PT rules (Portugal, UBL) 2.1.1
- Context: `//ubl:Invoice/cac:InvoiceLine/cbc:ID | //cn:CreditNote/cac:CreditNoteLine/cbc:ID`
- Test: `count(//ubl:Invoice/cac:InvoiceLine/cbc:ID | //cn:CreditNote/cac:CreditNoteLine/cbc:ID) = count(distinct-values(//ubl:Invoice/cac:InvoiceLine/cbc:ID | //cn:CreditNote/cac:CreditNoteLine/cbc:ID))`

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