public GestionCobranza grabarGestionCobranza(GestionCobranza o) throws BusinessException {
   GestionCobranza dto = null;
   try {
     dto = dao.grabar(o);
   } catch (DAOException e) {
     throw new BusinessException(e);
   } catch (Exception e) {
     throw new BusinessException(e);
   }
   return dto;
 }