# FX-SCH-A-000010

Source: https://xmlvalid.com/rules/FX-SCH-A-000010

> An Invoice shall have a Specification identifier (BT-24).

- Level: error
- Rule sets: Factur-X MINIMUM rules 1.09, Factur-X BASIC rules 1.09
- Context: `/rsm:CrossIndustryInvoice`
- Test: `(rsm:ExchangedDocumentContext/ram:GuidelineSpecifiedDocumentContextParameter/ram:ID != '')`

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