# FX-SCH-A-000791

Source: https://xmlvalid.com/rules/FX-SCH-A-000791

> Value of '@format' is not allowed.

- 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: `string-length($codeValue17)=0 or document('FACTUR-X_EXTENDED_codedb.xml')/codedb/cl[@id=17]/enumeration[@value=$codeValue17]`

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