# BR-64

Source: https://xmlvalid.com/rules/BR-64

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

- Level: error
- Rule sets: EN 16931 rules (UBL) 1.3.17, EN 16931 rules 1.3.16 (UBL), EXTENDED-CTC-FR rules (UBL) 1.4.0.04, Romanian RO e-Factura rules (UBL) 1.0.9
- Context: `cac:InvoiceLine/cac:Item/cac:StandardItemIdentification/cbc:ID | cac:CreditNoteLine/cac:Item/cac:StandardItemIdentification/cbc:ID`
- Test: `exists(@schemeID)`

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

- Level: error
- Rule sets: EN 16931 rules (CII) 1.3.17, EN 16931 rules 1.3.16 (CII), EXTENDED-CTC-FR rules (CII) 1.4.0.04
- Context: `//ram:IncludedSupplyChainTradeLineItem`
- Test: `normalize-space(ram:SpecifiedTradeProduct/ram:GlobalID/@schemeID) != '' or not (ram:SpecifiedTradeProduct/ram:GlobalID)`

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

- Level: error
- Rule sets: Factur-X EN 16931 rules 1.09.2, Factur-X EXTENDED rules 1.09.2
- 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