# FX-SCH-A-000208

Source: https://xmlvalid.com/rules/FX-SCH-A-000208

> The Item standard identifier (BT-157) shall have a Scheme identifier.

- Level: error
- Rule sets: Factur-X BASIC rules 1.09
- Context: `//ram:IncludedSupplyChainTradeLineItem`
- Test: `ram:SpecifiedTradeProduct/ram:GlobalID/@schemeID!='' or not (ram:SpecifiedTradeProduct/ram:GlobalID)`

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