# ibr-sr-33

Source: https://xmlvalid.com/rules/ibr-sr-33

> Supporting document description (ibt-123) MUST occur maximum once

- Level: error
- Rule sets: PINT Billing rules 1.1.3, PINT Billing rules (as shipped with PINT AE) 1.0.4
- Context: `cac:AdditionalDocumentReference`
- Test: `(count(cbc:DocumentDescription) <= 1)`

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