EDIT

    @ManyToOne(fetch = FetchType.LAZY)

    @Cascade({CascadeType.SAVE_UPDATE,CascadeType.MERGE})

    @FieldBridge(impl=NotNullAwareIdBridge.class)

//******************* FACTORY ********************************************/

     * Returns the {@link TaxonName taxon name} to which <i>this</i> taxon name description

     * provides additional information not ruled by a {@link NomenclaturalCode nomenclatural code}.

     */

        return taxonName;

    }