# XV-MY-24

Source: https://xmlvalid.com/rules/XV-MY-24

> The contact number of the supplier and of the buyer (cac:Contact/cbc:Telephone) is mandatory, NA where LHDN allows it; the … has none.

- Level: error
- Rule sets: MyInvois validations of LHDN (Malaysia) MyInvois SDK of 25 September 2026
- Context: `/*/cac:AccountingSupplierParty/cac:Party | /*/cac:AccountingCustomerParty/cac:Party`
- Test: `$phone ne ''`

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