@Override
    public int hashCode() {
        int result = novCedula != null ? novCedula.hashCode() : 0;
        result = 31 * result + (novCodigoConcepto != null ? novCodigoConcepto.hashCode() : 0);
        result = 31 * result + (novUnidad != null ? novUnidad.hashCode() : 0);
        result = 31 * result + (novAaaamm != null ? novAaaamm.hashCode() : 0);
        return result;
    }