Hibernate, missing support for Order-By attribute i set

I can’t find a way to set “order-by” attribute for at set in Hibernate XML mapping, ex.:

<set name="childKonto" lazy="true" cascade="save-update,lock" inverse="true" order-by="nummer asc">
			<key column="parent_konto_ident" not-null="false"/>
			<one-to-many class="dk.kyborg.database.entities.kontoplan.Konto"/>
		</set>

I can add it manually, then it’s removed when I generate the code again.