public int getGroupId(IWContext iwc) throws Exception {
   /** @todo cach */
   if (groupId != -1) {
     GenericGroup gr =
         ProjectBusiness.getProjectParticipantGroup(
             groupId, ProjectBusiness.getCurrentProjectId(iwc));
     if (gr != null) {
       return gr.getID();
     }
   }
   return -1;
 }