# ibr-056

Source: https://xmlvalid.com/rules/ibr-056

> The Seller tax representative party (ibg-11) MUST have a Seller tax representative Tax identifier (ibt-063).

- Level: error
- Rule sets: PINT Billing rules 1.1.3, PINT Billing rules (as shipped with PINT AE) 1.0.4
- Context: `cac:TaxRepresentativeParty`
- Test: `exists(cac:PartyTaxScheme/cbc:CompanyID)`

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