Following implementation of Retention Policies in the FSM (for more check here) the handling of a new message type got introduced in the Connector. This message <DATADELETEDEVENT> is sent by FSM when objects get removed. Connector by itself does not delete any object removed in FSM as a result of implementation of Retention Policy however information about these objects are stored in the dedicated table.
In order to make use of these information one must implement BADI /PACG/ECM_DELETE_RETENTION