A resource request set is a group of resource requests. If your administrator has configured PSA to use resource request sets, you can use a resource request set to hold several resources for a particular task. When one of the resource requests in the resource request set is staffed, the status of the other resource requests in that set are set to Cancelled.
The diagram that follows shows the life cycle of a resource request setA group of resource requests. You can use resource request sets to hold more than one resource against a resource request..