# PEPPOL-T19-B08901

Source: https://xmlvalid.com/rules/PEPPOL-T19-B08901

> Attribute 'schemeID' MUST be present.

- Level: error
- Rule sets: Peppol Catalogue rules 3.5
- Context: `/ubl:Catalogue/cac:ContractorCustomerParty/cac:Party/cbc:EndpointID`
- Test: `@schemeID`

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