# FX-SCH-A-000790

Source: https://xmlvalid.com/rules/FX-SCH-A-000790

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

- Level: error
- Rule sets: Factur-X EXTENDED rules 1.09.2
- Context: `/rsm:CrossIndustryInvoice/rsm:SupplyChainTradeTransaction/ram:ApplicableHeaderTradeDelivery/ram:DespatchAdviceReferencedDocument/ram:FormattedIssueDateTime/qdt:DateTimeString`
- Test: `@format`

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