Documents with CAE number cannot be modified

What causes this issue?

You want to cancel a document with a CAE number or change the document
date. This is, however, not possible because the document has already
been approved by the AFIP.

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.