<?xml version="1.0"?>

<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 2.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping>
    <class name="test.Operation" table="T_Operation"
        dynamic-update="false" dynamic-insert="false">
        <id name="id" column="OperID" type="string" length="5">
            <generator class="assigned"/>
        </id>
        <property name="parentId" type="string" update="true"
            insert="true" column="ParentID" length="5"/>
        <property name="operName" type="string" update="true"
            insert="true" column="OperName" length="20"/>
        <property name="description" type="string" update="true"
            insert="true" column="Description" length="128"/>
       
        <many-to-one name="parent" class="test.Operation" cascade="none"
            outer-join="auto" update="true" insert="true" column="ParentID"
            not-null="false"/>
        <set name="operations" table="T_Operations" lazy="false"
            inverse="true" cascade="all" sort="unsorted">
              <key column="ParentID"/>
              <one-to-many class="test.Operation" />
        </set>
    </class>
</hibernate-mapping>

package com.regical.eoss.db;

import java.util.Set;

/**
* @hibernate.class table="T_Operation"
*/
public class Operation {
    private String id;
    private String parentId;
    private String operName;
    private String description;

    private Set operations;

    private Operation parent;

    /**
     * @hibernate.id generator-class="assigned" column="OperID"
     *               type="string" length="5"
     * @return
     */
    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    /**
     * @hibernate.property column="ParentID" type="string" length="5"
     * @return
     */
    public String getParentId() {
        return parentId;
    }

    public void setParentId(String id) {
        this.parentId = id;
    }

    /**
     * @hibernate.property column="OperName" type="string" length="20"
     * @return
     */
    public String getOperName() {
        return operName;
    }

    public void setOperName(String name) {
        this.operName = name;
    }

    /**
     * @hibernate.property column="Description" type="string" length="128"
     * @return
     */
    public String getDescription() {
        return this.description;
    }

    public void setDescription(String desp) {
        this.description = desp;
    }

    /**
     * @hibernate.many-to-one role="parent" column="ParentID" not-null="false"
     *                        class="com.regical.eoss.db.Operation"
     */
    public Operation getParent() {
        return parent;
    }

    public void setParent(Operation oper) {
        parent = oper;
    }

    /**
     * @hibernate.set role="ChildOpers" table="T_Operations" cascade="all"
     *                inverse="true"
     * @hibernate.collection-key column="ParentID"
     * @hibernate.collection-one-to-many class="com.regical.eoss.db.Operation"
     * @param opers
     * @return
     */
    public Set getOperations() {
        return operations;
    }

    public void setOperations(Set opers) {
        this.operations = opers;
    }
}

net.sf.hibernate.MappingException: Repeated column in mapping for class com.regical.eoss.db.Operation should be mapped with insert="false" update="false": ParentID