Value to set.
If empty, any existing value will be removed.
Possible transformations of the current State to other States of the same `type` (for example, _Initial_ -> _Shipped_).
When performing a `transitionState` update action and `transitions` is set, the currently referenced State must have a transition to the new State.
If `transitions` is an empty list, it means the current State is a final State and no further transitions are allowed.
If `transitions` is not set, the validation is turned off.
When performing a `transitionState` update action, any other State of the same `type` can be transitioned to.
Value to set. If empty, any existing value will be removed.