# FX-SCH-A-000001

Source: https://xmlvalid.com/rules/FX-SCH-A-000001

> 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: Factur-X MINIMUM rules 1.09, Factur-X BASIC rules 1.09
- Context: `//ram:SellerTradeParty`
- Test: `(ram:ID) or (ram:GlobalID) or (ram:SpecifiedLegalOrganization/ram:ID) or (ram:SpecifiedTaxRegistration/ram:ID[@schemeID='VA'])`

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