insert- update operation in hibernate

[ved gunjan]

hi all,
I'm novice to the hibernate world...i've a simple application wherein i've <many-to-one relation between two valueobject.
Below is my .hbm.xml file.

<?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="com.manheim.cis.business.contact.beans.EntityAddressVO"
table="ENTADDR">
<composite-id >
<key-property name="entityId" column="ENT_ID" />
<key-property name="addrId" column="ADDR_ID" />
</composite-id>
<property name="addrType" column="ADDR_TYPE" />
<property name="effectiveDate" column="EFFECTIVE_DATE" />
<property name="businessUse" column="BUSINESS_USE" />
<property name="instruction" column="DELIVERY_INSTRUCTION" />
<property name="defaultAddr" column="DEFAULT_ADDR" />
<property name="optOutDate" column="OPT_OUT_DATE" />
<property name="optOutMethod" column="OPT_OUT_METHOD" />
<property name="optOutRequester" column="OPT_OUT_REQUESTER" />
<property name="expireDate" column="EXPIRE_DATE" />
<property name="createdDate" column="CREATE_DATE" />
<property name="createdBy" column="CREATE_BY" />
<property name="updatedTime" column="UPDATE_TIME" />
<property name="updatedBy" column="UPDATE_BY" />
<many-to-one name="addressVO" column="ADDR_ID"
class="com.manheim.cis.business.contact.beans.AddressVO"
insert="false" update="false" cascade="all">
</many-to-one>
</class>
<class name="com.manheim.cis.business.contact.beans.AddressVO"
table="ADDR">
<id name="addrId" column="ADDR_ID" unsaved-value="null" >
<generator class="increment"></generator>
</id>
<property name="addr1" column="ADDR1" />
<property name="addr2" column="ADDR2" />
<property name="city" column="CITY" />
<property name="county" column="COUNTY" />
<property name="state" column="STATE" />
<property name="zip" column="ZIP_CODE" />
<property name="countryName" column="COUNTRY_NAME" />
<property name="countryCode" column="COUNTRY_CODE" />
<property name="latitude" column="LATITUDE" />
<property name="longtitude" column="LONGITUDE" />
<property name="timeZone" column="TIMEZONE" />
<property name="createdDate" column="CREATE_DATE" />
<property name="createdBy" column="CREATE_BY" />
</class>
</hibernate-mapping>


This is the hibernate generated query:
insert into ADDR (ADDR1, ADDR2, CITY, COUNTY, STATE, ZIP_CODE, COUNTRY_NAME, COUNTRY_CODE, LATITUDE, LONGITUDE, TIMEZONE, CREATE_DATE, CREATE_BY, ADDR_ID) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)

insert into ENTADDR (ADDR_TYPE, EFFECTIVE_DATE, BUSINESS_USE, DELIVERY_INSTRUCTION, DEFAULT_ADDR, OPT_OUT_DATE, OPT_OUT_METHOD, OPT_OUT_REQUESTER, EXPIRE_DATE, CREATE_DATE, CREATE_BY, UPDATE_TIME,

UPDATE_BY, ENT_ID, ADDR_ID) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
update ADDR set ADDR1=?, ADDR2=?, CITY=?, COUNTY=?, STATE=?, ZIP_CODE=?, COUNTRY_NAME=?, COUNTRY_CODE=?, LATITUDE=?, LONGITUDE=?, TIMEZONE=?, CREATE_DATE=?, CREATE_BY=? where ADDR_ID=?


My doubt is why hibernate is going for an update operation in to ADDR table after doing a insert in ADDR table and how to prevent it.
I've tried with all the possible combination of unsaved-value attributes in both the valueobjects/tables.

Also please can any one cleary explain the meaning of unsaved-value attributes and its possible values and how it is realted to the object beign persisted.

Thanx in advance for any kind of help!!!

Regards
Ved