The SnapMirror relationship within a cascade topology is failing with: The source "svm:volume" is the destination of a SnapMirror relationship with policy "policy" which has Snapshot copy creation sch...The SnapMirror relationship within a cascade topology is failing with: The source "svm:volume" is the destination of a SnapMirror relationship with policy "policy" which has Snapshot copy creation schedules. It is possible to start seeing the error after upgrading from a version of ONTAP where the unsupported configuration was not blocked, to a version of ONTAP where the unsupported configuration is blocked.
