# ibr-018

Source: https://xmlvalid.com/rules/ibr-018

> The Seller tax representative name (ibt-062) MUST be provided in the Invoice, if the Seller (ibg-04) has a Seller tax representative party (ibg-11)

- 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: `normalize-space(cac:PartyName/cbc:Name) != ''`

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