- model_to_implement.mdl - Shows the full model that is to be implemented
- model_with_subsys.mdl - Shows how this can be done with a simple subsystem
- model_with_ref_default.mdl and ref_model_default.mdl - Show how just copying the contents of the subsystem to a new model leads to the error that you are getting
- model_with_ref_inports_set.mdl and ref_model_inports_set.mdl - Show how the first mentioned method is applied
- model_with_ref_simulinksignal.mdl and ref_model_simulinksignal.mdl - Show how the second mentioned method is applied