# PEPPOL-T01-B03801

Source: https://xmlvalid.com/rules/PEPPOL-T01-B03801

> Attribute 'schemeID' MUST be present.

- Level: error
- Rule sets: Peppol Order rules 3.7
- Context: `/ubl:Order/cac:BuyerCustomerParty/cac:Party/cbc:EndpointID`
- Test: `@schemeID`

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