& already requested

What causes this issue?

Within document entry, several similar correspondence requests cannot
be entered for the document. You can, however, request different
correspondence TYPES for the document.

System Response

The request is not stored.

How to fix this error?

If you want to request another correspondence type, enter a new
correspondence request with the valid specifications. If you want to
request the same correspondence type for this document again, because,
for example, you want to predefine an alternative text or alternative
periods, you must request this correspondence separately after
completing the posting transaction. To do this, select <LS>Account
</>-> <LS>Correspondence </>-> <LS>Request </> in the menu of the
application area. If you want to cancel correspondence requests before
printing, select <LS>Account </>-> <LS>Correspondence </>-> <LS>Edit
</> in the menu of the application area.

Error message extract from SAP system. Copyright SAP SE.