# CF412

Source: https://xmlvalid.com/rules/CF412

> Enter valid TTX registration number and maximum length is 17 characters - ….

- 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: `every $t in $ttx satisfies string-length(normalize-space($t)) le 17`

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