Cancellation not possible; eDocument has been already approved

What causes this issue?

You are trying to cancel a document for which an eDocument exists that
has already been approved by the tax authorities.

System Response

The system does not cancel a source document for which an approved
eDocument already exists.

How to fix this error?

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

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.