# BR-56

Source: https://xmlvalid.com/rules/BR-56

> Each Seller tax representative party (BG-11) shall have a Seller tax representative VAT identifier (BT-63).

- 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, Romanian RO e-Factura rules (UBL) 1.0.9
- Context: `cac:TaxRepresentativeParty`
- Test: `exists(cac:PartyTaxScheme[cac:TaxScheme/(normalize-space(upper-case(cbc:ID)) = 'VAT')]/cbc:CompanyID)`

> Each Seller tax representative party (BG-11) shall have a Seller tax representative VAT identifier (BT-63).

- 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
- Context: `//ram:SellerTaxRepresentativeTradeParty`
- Test: `normalize-space(ram:SpecifiedTaxRegistration/ram:ID[@schemeID='VA']) != ''`

> Each Seller tax representative party (BG-11) shall have a Seller tax representative VAT identifier (BT-63).

- Level: error
- Rule sets: Factur-X BASIC WL rules 1.09, Factur-X EN 16931 rules 1.09.2, Factur-X EXTENDED rules 1.09.2
- Context: `//ram:SellerTaxRepresentativeTradeParty`
- Test: `(ram:SpecifiedTaxRegistration/ram:ID[@schemeID='VA']!='')`

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