# XV-MY-19

Source: https://xmlvalid.com/rules/XV-MY-19

> The supplier's tourism tax registration number is a mandatory field: cac:PartyIdentification/cbc:ID with schemeID TTX, NA when not registered.

- Level: warning
- Rule sets: MyInvois validations of LHDN (Malaysia) MyInvois SDK of 25 September 2026
- Context: `/*/cac:AccountingSupplierParty/cac:Party | /*/cac:AccountingCustomerParty/cac:Party`
- Test: `not($supplier) or exists($ttx)`

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