According to the SysML specification, a bound reference must have a binding connector to a property or a nested property of an owning block. Therefore, Magic Model Analyst / Cameo Simulation Toolkit will set the value of the bound reference so that it works with the properties connected with the binding connector. In exceptional circumstances, for example, if a Classifier that types a bound reference is a subtype of a Classifier that types a property at the other end of a binding connector, Magic Model Analyst / Cameo Simulation Toolkit will use the Classifier that types the bound reference to initialize the object. You can see more information about binding connector simulation in Binding Connector.
Executing a Block Vehicle that contains Bound references.