# F-LIB306

Source: https://xmlvalid.com/rules/F-LIB306

> Exactly one TaxTotal class must contain VAT (Moms)

- Level: error
- Rule sets: OIOUBL 2.1 Invoice rules (Denmark) 1.17.2, OIOUBL 2.1 Credit Note rules (Denmark) 1.17.2, OIOUBL 2.1 Reminder rules (Denmark) 1.17.2
- Test: `count(../cac:TaxTotal[cac:TaxSubtotal/cac:TaxCategory/cac:TaxScheme/cbc:ID = '63' or cac:TaxSubtotal/cac:TaxCategory/cac:TaxScheme/cbc:ID = 'VAT']) = 1`

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