The corresponding CO document has already been reversed

What causes this issue?

CO document &V4& is assigned to the FI document &V2& in company code
&V1& and fiscal year &V4&. This document is indicated as already
cancelled.

System Response

Since the cost accounting document has already been reversed, it cannot
be reversed again. The FI document cannot be reversed either.

How to fix this error?

This is an internal system error. Contact the SAP hotline service.

Error message extract from SAP system. Copyright SAP SE.