QSM-02225
Materialized view does not contain the FMARKER of the referenced external table.
Cause
File Change Tracking (FCT) FAST REFRESH after a modification or deletion of files is not supported because the materialized view does not contain the FMARKER of the referenced external table.
Action
Include the FMARKER of the referenced external table by adding DBMS_MVIEW.FMARKER() to the SELECT list of the materialized view query, and to the GROUP BY list where applicable.