# W-INV323

Source: https://xmlvalid.com/rules/W-INV323

> Invoice line '…' with lineExtensionAmount (…) cannot be evaluated since either 'cbc:CalculationRate', 'cbc:MathematicOperatorCode' or both are not present in 'Invoice/cac:PricingExchangeRate'

- Level: warning
- Rule sets: OIOUBL 2.1 Invoice rules (Denmark) 1.17.2
- Context: `doc:Invoice/cac:InvoiceLine`
- Test: `($notFree and not($noExchangeRate) and $CRandMOC)`

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