Oracle Message QSM-01077 - materialized view, string, is grouping at a higher level than query

ERRORmaterialized view, string, is grouping at a higher level than query
CAUSEIf a query column, which is not present in the materialized view, can be obtained by a rollup within the materialized view, then it should group at a higher level than the materialized view.
ACTIONNone