In the work queue, you can right-click and force retry an exceptioned item... but there's not action from BP to do that inside the process when the exception occurs from a separate business object. Currently if there's a failure outside of the BO, or outside of the process as a whole, the only way to force a retry is to either go in the queue manager and right-click or completely rebuild a clone of the work queue item
It boils down to this: