# ibr-co-26

Source: https://xmlvalid.com/rules/ibr-co-26

> In order for the buyer to automatically identify a supplier, the Seller identifier (ibt-029), the Seller legal registration identifier (ibt-030) and/or the Seller Tax identifier (ibt-031) MUST be present.

- Level: error
- Rule sets: PINT Billing rules 1.1.3, PINT Billing rules (as shipped with PINT AE) 1.0.4
- Context: `cac:AccountingSupplierParty/cac:Party`
- Test: `exists(cac:PartyTaxScheme/cbc:CompanyID) or exists(cac:PartyIdentification/cbc:ID) or exists(cac:PartyLegalEntity/cbc:CompanyID)`

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