My Oracle DBA's have reported issues using SnapCenter whereby following a restore subsequent backups fail due to an undeletable snapshot owned by "SIS Clone". This also results in no snapshots possible to be created (e.g. manual or scheduled SnapMirror snapshots). I have a case raised but thought I'd post here as well. I've looked through mgwd, ems, and sktrace logs but not spotted anything. From their testing it seems consistent that when they follow the scenario "backup->restore->backup" that they get this problem.
SnapCenter Server 4.6 P1 Build 4.6.0.7006
OnTap 9.7P17