# FX-SCH-A-000426

Source: https://xmlvalid.com/rules/FX-SCH-A-000426

> Attribute '@schemeID' is required in this context.

- 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: `/rsm:CrossIndustryInvoice/rsm:SupplyChainTradeTransaction/ram:ApplicableHeaderTradeAgreement/ram:BuyerTradeParty/ram:SpecifiedTaxRegistration/ram:ID`
- Test: `@schemeID`

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