# FX-SCH-A-001021

Source: https://xmlvalid.com/rules/FX-SCH-A-001021

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

- Level: error
- Rule sets: Factur-X EXTENDED rules 1.09.2
- Context: `/rsm:CrossIndustryInvoice/rsm:SupplyChainTradeTransaction/ram:IncludedSupplyChainTradeLineItem/ram:SpecifiedLineTradeAgreement/ram:AdditionalReferencedDocument/ram:AttachmentBinaryObject`
- Test: `@filename`

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