# F-LIB264

Source: https://xmlvalid.com/rules/F-LIB264

> Invalid CalculationSequenceNumeric. Must not be negative or zero

- Level: error
- Rule sets: OIOUBL 2.1 Invoice rules (Denmark) 1.17.2, OIOUBL 2.1 Credit Note rules (Denmark) 1.17.2, OIOUBL 2.1 Reminder rules (Denmark) 1.17.2
- Test: `cbc:CalculationSequenceNumeric and (starts-with(cbc:CalculationSequenceNumeric, '-') or cbc:CalculationSequenceNumeric = 0)`

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