http://www.hibernate.org/Documentation/ ... rseTrue#A3
the<one-to-many>,<many-to-one> sample in the above hyper link document states


<class name="net.sf.test.Parent" table="parent">
<id name="id" column="id" type="long" unsaved-value="null">
<generator class="sequence">
<param name="sequence">SEQ_DEFAULT</param>
</generator>
</id>
<set name="children" lazy="true" inverse="true">
<key column="parent_id"/>
<one-to-many class="net.sf.test.Child"/>
</set>
</class>

<class name="net.sf.test.Child" table="child">
<id name="id" column="id" type="long" unsaved-value="null">
<generator class="sequence">
<param name="sequence">SEQ_DEFAULT</param>
</generator>
</id>
<many-to-one name="parent" column="parent_id" not-null="true"/>
</class>

in the <many-to-one> element the column value is defined as column="parent_id". I believe it should be changed to column="the column name in child table, refering to parent"

Well thats just what parent_id is, isn't it?