Demand Management for IT demand events do not occur if one of the following conditions exists:
There is required look-ahead for the transition. The exception to this exception is when the look-ahead requires you to specify an assigned-to user during the assignment of IT demand.
You do not have the required security permissions (IT demand request type and workflow step) to transition out of the workflow step.
The IT demand request type is locked for editing by another user.
If the scheduling, assignment, or rejecting event does not work, an error message is returned.