I'm not sure whether it is the optimal solution but it works
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
assembly="NHTest" namespace="NHTest.Model" auto-import="true">
<class name="Header" table="Header">
<id name="HeaderId" column="HeaderId">
<generator class="native" />
</id>
<many-to-one name="LatestVersion" entity-name="LatestVersion"
column="LatestVersionId"
cascade="save-update" not-null="true" /
>
<many-to-one name="LatestApprovedVersion" entity-
name="LatestApprovedVersion"
column="LatestApprovedVersionId"
cascade="save-update" not-
null="true" />
</class>
<class name="Version" entity-name="LatestVersion" table="Version">
<id name="VersionId" column="VersionId">
<generator class="native" />
</id>
<one-to-one name="Header" property-ref="LatestVersion"
constrained="true" />
</class>
<class name="Version" entity-name="LatestApprovedVersion"
table="Version">
<id name="VersionId" column="VersionId">
<generator class="native" />
</id>
<one-to-one name="Header" property-ref="LatestApprovedVersion"
constrained="true" />
</class>
</hibernate-mapping>
Use constrained="true" only if the respective foreign key in the
Header table doesn't allow null values.
In this case NH will not use outer joins when loading Version
association.
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