I wouldn't say I entirely understand the scenario, just a couple of things come to mind.
First, warning messages always require a manual action such an an ENTER press. Why would you expect the processing to continue after the warning without any confirmation action? That would be a success message.
Second thing is: how does the transaction behave when you are running it in the webgui? Personas won't behave differently and has no control over the webgui flow. Are you saying that when you are running the transaction using Personas, it doesn't match the processing flow of webgui?