# ibr-sr-49

Source: https://xmlvalid.com/rules/ibr-sr-49

> Value tax point date (ibt-007) 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: `/ubl:Invoice | /cn:CreditNote`
- Test: `(count(cac:InvoicePeriod/cbc:DescriptionCode) <=1)`

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