# FX-SCH-A-000726

Source: https://xmlvalid.com/rules/FX-SCH-A-000726

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

- Level: error
- Rule sets: Factur-X EXTENDED rules 1.09.2
- Context: `/rsm:CrossIndustryInvoice/rsm:SupplyChainTradeTransaction/ram:ApplicableHeaderTradeAgreement/ram:ProductEndUserTradeParty/ram:SpecifiedTaxRegistration/ram:ID`
- Test: `@schemeID`

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