# FX-SCH-A-000015

Source: https://xmlvalid.com/rules/FX-SCH-A-000015

> An Invoice shall contain the Seller name (BT-27).

- Level: error
- Rule sets: Factur-X MINIMUM rules 1.09, Factur-X BASIC rules 1.09
- Context: `/rsm:CrossIndustryInvoice`
- Test: `(rsm:SupplyChainTradeTransaction/ram:ApplicableHeaderTradeAgreement/ram:SellerTradeParty/ram:Name!='')`

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