Cancel of NF is not allowed because financial period is closed

What causes this issue?

The selected invoice has a corresponding Nota Fiscal. Since the
financial period of the original document is not open anymore, it is
not allowed to cancel the Nota Fiscal.
Therefore it is not possible to cancel the selected invoice.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Create a credit note and correct the tax amounts.

Error message extract from SAP system. Copyright SAP SE.