SAP Message >6821 - Not possible to logically delete inbound correspondence &1

Diagnosis
When a correspondence request is deleted, a deletion indicator is set inthe correspondence header so that other processes (such as output) canrespond accordingly. Since inbound correspondence does not have acorrespondence header, it is not possible to set this indicator.Therefore, logical deletion of inbound correspondence &V1& ofcorrespondence type &V2& is not possible.

System Response
The inbound correspondence is not logically deleted.