Disable automatic retry?

Hi:

I'm currently using SOAPUI Pro 6.1. I've noticed that in some cases if a SOAPUI request fails authentication, then SOAPUI will automatically send the request again. Is there any way to turn this feature off? I don't ever want to send a second request, as my test case is expecting the authentication to fail. I have 'Authenticate Preemptively' turned on.

Thanks,
Dave