Validating and Saving the Model
When you have completed all of the above steps, click Save. When you do this, the model is validated. If there are no validation errors, the lifecycle model is stored. If any part of the model is invalid, this will be indicated by an appropriate error message.
A model is valid if:
it consists of at least one state, and
there is a possible transition path to all of the states except the first state.
