# BR-CO-26

Source: https://xmlvalid.com/rules/BR-CO-26

> In order for the buyer to automatically identify a supplier, the Seller identifier (BT-29), the Seller legal registration identifier (BT-30) and/or the Seller VAT identifier (BT-31) shall be present. 

- Level: error
- Rule sets: EN 16931 rules (UBL) 1.3.17, EN 16931 rules 1.3.16 (UBL), EXTENDED-CTC-FR rules (UBL) 1.4.0.04
- Context: `cac:AccountingSupplierParty`
- Test: `exists(cac:Party/cac:PartyTaxScheme[cac:TaxScheme/normalize-space(upper-case(cbc:ID))='VAT']/cbc:CompanyID) or exists(cac:Party/cac:PartyIdentification/cbc:ID[not(@schemeID = 'SEPA')]) or exists(cac:Party/cac:PartyLegalEntity/cbc:CompanyID)`

> In order for the buyer to automatically identify a supplier, the Seller identifier (BT-29), the Seller legal registration identifier (BT-30) and/or the Seller VAT identifier (BT-31) shall be present.

- Level: error
- Rule sets: EN 16931 rules (CII) 1.3.17, EN 16931 rules 1.3.16 (CII), EXTENDED-CTC-FR rules (CII) 1.4.0.04, Factur-X BASIC WL rules 1.09, Factur-X EN 16931 rules 1.09.2, Factur-X EXTENDED rules 1.09.2
- Context: `//ram:SellerTradeParty`
- Test: `(ram:ID) or (ram:GlobalID) or (ram:SpecifiedLegalOrganization/ram:ID) or (ram:SpecifiedTaxRegistration/ram:ID[@schemeID='VA'])`

> In order for the buyer to automatically identify a supplier, the Seller identifier (BT-29), the Seller legal registration identifier (BT-30) and/or the Seller VAT identifier (BT-31) shall be present. 

- Level: error
- Rule sets: Romanian RO e-Factura rules (UBL) 1.0.9
- Context: `cac:AccountingSupplierParty`
- Test: `exists(cac:Party/cac:PartyTaxScheme[cac:TaxScheme/normalize-space(upper-case(cbc:ID))='VAT']/cbc:CompanyID) or exists(cac:Party/cac:PartyIdentification/cbc:ID) or exists(cac:Party/cac:PartyLegalEntity/cbc:CompanyID)`

## Why it fails

- The seller has neither an identifier (`cac:PartyIdentification`), nor a legal registration identifier (`cac:PartyLegalEntity/cbc:CompanyID`), nor a VAT identifier.

## How to fix it

- Add at least one of them; usually the seller's VAT identifier in `cac:PartyTaxScheme/cbc:CompanyID` with the tax scheme `VAT`.

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