Carryover documents cannot be deleted

What causes this issue?

You are not allowed to delete carry-over document selected by your
criteria.
Carry-over documents can only be deleted if :
-1/ the both fiscal years contained in the lines of the document are
selected in your criteria
or 2/ - the carry-over document is a reversed or a reversal document.

System Response

Deletion is stopped.

How to fix this error?

The cleanest solution is to first reverse these carry-over documents.
In these case you will be able to delete them.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.