How can I delete (mark as failed) this Observation 2769317: Phase 3-B (14129)

My auto-scheduler added this very long lasting record and I can not mark it as failed or delete it.
Can someone with admin rights please help?
Thank you.

Regarding Observation 2769317

Just ignore it. All such observations, either new or old, will be marked as failed automatically sooner or later by the system.

Ok, thank you very much.