# FX-SCH-A-000583

Source: https://xmlvalid.com/rules/FX-SCH-A-000583

> Value of '@format' is not allowed.

- Level: error
- Rule sets: Factur-X EN 16931 rules 1.09.2
- Context: `/rsm:CrossIndustryInvoice/rsm:SupplyChainTradeTransaction/ram:ApplicableHeaderTradeDelivery/ram:ActualDeliverySupplyChainEvent/ram:OccurrenceDateTime/udt:DateTimeString`
- Test: `string-length($codeValue3)=0 or document('FACTUR-X_EN16931_codedb.xml')/codedb/cl[@id=3]/enumeration[@value=$codeValue3]`

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