Adding business logic
You can add logic to a stub to determine whether and how it should respond to a received request.
Add business logic to a stub on the Activity page within the Events tab. Choose Business Logic in the Event Activity option. If you choose Business Logic, you can add a Pass-through action to define explicit pass-through behavior that must be executed depending on the logic added to the stub.
For example, if a received message contains data that matches a particular condition, the configured Pass-through action could generate an error. Alternatively, the action could be configured to discard the message or to let the message pass-through to the system under test (the possible actions depend on the transport being used).
For more information, see The Activity tab.