Cameo Simulation Toolkit DOES NOT leverage a Reception on a Class/Block at all! Use an AcceptEventAction with a SignalEvent trigger or an 'effect' on a Transition instead. There is a formal fUML restriction that a Reception should not have a method.

Use an AcceptEventAction with a SignalEvent trigger in an Activity or an 'effect' on a Transition in a StateMachine instead.

There is also an fUML restriction that a Reception should not have a method (although it is not enforced by the validation engine of Cameo):