# PEPPOL-T01-B30301

Source: https://xmlvalid.com/rules/PEPPOL-T01-B30301

> Attribute 'schemeID' MUST be present.

- Level: error
- Rule sets: Peppol Order rules 3.7
- Context: `/ubl:Order/cac:OrderLine/cac:LineItem/cac:Item/cac:StandardItemIdentification/cbc:ID`
- Test: `@schemeID`

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