Reversal for document &1 is being checked; check reason &2 set

What causes this issue?

You want to check whether document &V1& may be reversed. You therefore
entered check indicator &V2& in the document and a workflow was started
for the check.

System Response

Note message

How to fix this error?

You do not have to carry out any further action. If the reversal is
approved, it is automatically posted with the approval. If the reversal
is rejected, the check indicator is removed.

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.