# XV-MY-21

Source: https://xmlvalid.com/rules/XV-MY-21

> The supplier's business activity description (the name attribute of cbc:IndustryClassificationCode) is a mandatory field.

- 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: `$msic = '' or normalize-space(cbc:IndustryClassificationCode/@name) ne ''`

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