...
The model ITSM Incident for the Incident table exists. and among others, there is the transition:
In this screenshot, the Completed state can be changed to the Rejected by User. Closed, In Progress and Assigned states. Also, if the state will not change for the 3 days 8 hours (on a 8-5 weekdays calendar; it's equivalent 10 working days 8 hours each), then it will happen automatically.
We can see transitions defined by this model for the Completed state on the incident form.
The Completed state