public ActionForward deleteSupervisor(ActionMapping mapping, ActionForm form, HttpServletRequest request,
HttpServletResponse response) {
final String personId = request.getParameter("supervisorId");
Person person = (Person) FenixFramework.getDomainObject(personId);
final String registrationProtocolId = request.getParameter("registrationProtocolId");
RegistrationProtocol registrationProtocol = FenixFramework.getDomainObject(registrationProtocolId);
ManageExternalSupervisionBean bean = new ManageExternalSupervisionBean(registrationProtocol);
bean.removeSupervisor(person);
request.setAttribute("sessionBean", bean);