In the application the relationship is one to many.I am using DB2. When i am inserting from application both parent and child records are creating. But when i am deleting it is throwing following exception.

[2/12/09 21:34:34:442 IST] 3021d4b5 SystemOut O Hibernate: update RNT_CHG_VND set RNT_CHG_HST_ID=null where RNT_CHG_HST_ID=?
[2/12/09 21:34:34:442 IST] 3021d4b5 SystemOut O Hibernate: update INT_CMP_RNT set RNT_CHG_HST_ID=null where RNT_CHG_HST_ID=?
[2/12/09 21:34:34:629 IST] 3021d4b5 JDBCException W net.sf.hibernate.util.JDBCExceptionReporter SQL Error: -407, SQLState: 23502
[2/12/09 21:34:34:629 IST] 3021d4b5 JDBCException E net.sf.hibernate.util.JDBCExceptionReporter [IBM][CLI Driver][DB2/NT] SQL0407N Assignment of a NULL value to a NOT NULL column "TBSPACEID=2, TABLEID=2, COLNO=1" is not allowed. SQLSTATE=23502

[2/12/09 21:34:34:644 IST] 3021d4b5 JDBCException E net.sf.hibernate.util.JDBCExceptionReporter could not delete collection: [com.kroger.accounting.rem.bo.RentChange.interCompanyRentPayee#57126]
[2/12/09 21:34:34:660 IST] 3021d4b5 JDBCException E net.sf.hibernate.util.JDBCExceptionReporter TRAS0014I: The following exception was logged COM.ibm.db2.jdbc.DB2Exception: [IBM][CLI Driver][DB2/NT] SQL0407N Assignment of a NULL value to a NOT NULL column "TBSPACEID=2, TABLEID=2, COLNO=1" is not allowed. SQLSTATE=23502



I have used the following hbm files..

parent table configuration

<hibernate-mapping>
<class
name="com.kroger.accounting.rem.bo.RentChange"
table="RNT_CHG_HST"
dynamic-update="false"
dynamic-insert="false"
>

<id
name="id"
column="RNT_CHG_HST_ID"
type="long"
unsaved-value="0"
>
<generator class="native">
</generator>
</id>

<property
name="arrears"
type="java.lang.Boolean"
update="true"
insert="true"
column="ARR_FL"
/>

<property
name="effectiveDate"
type="java.sql.Date"
update="true"
insert="true"
column="RNT_CHG_EFF_DT"
/>

<property
name="oneTimePayDate"
type="java.sql.Date"
update="true"
insert="true"
column="OTM_PMT_DT"
/>

<property
name="endDate"
type="java.sql.Date"
update="true"
insert="true"
column="RNT_CHG_END_DT"
/>
<bag
name="interCompanyRentPayee"
lazy="false"
inverse="false"
cascade="all-delete-orphan"
>

<key>
<column name="RNT_CHG_HST_ID"/>
</key>

<one-to-many
class="com.kroger.accounting.rem.bo.InterCompanyRent"
/>
</bag>

<!--
To add non XDoclet property mappings, create a file named
hibernate-properties-RentChange.xml
containing the additional properties and place it in your merge dir.
-->

</class>

</hibernate-mapping>

And the child table configuration is

<?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.kroger.accounting.rem.bo.InterCompanyRent"
table="INT_CMP_RNT"
dynamic-update="false"
dynamic-insert="false"
>

<id
name="id"
column="INT_CMP_RNT_ID"
type="long"
unsaved-value="0"
>
<generator class="native">
</generator>
</id>

<many-to-one
name="rentChange"
class="com.kroger.accounting.rem.bo.RentChange"
cascade="none"
outer-join="auto"
update="false"
insert="false"
>
<column
name="RNT_CHG_HST_ID"
/>
</many-to-one>
<property
name="rentChangeId"
type="java.lang.Long"
update="true"
insert="true"
column="RNT_CHG_HST_ID"
/>

<property
name="interCompanyRentAmount"
type="java.math.BigDecimal"
update="true"
insert="true"
column="INT_CMP_RNT_AMT"
/>

<property
name="InterCompanyRemExpensiveAcNumber"
type="com.kroger.accounting.rem.util.TrimmedUppercaseString"
update="true"
insert="true"
column="INT_CMP_REM_ACC_NO"
/>

<property
name="InterCompanyRetExpensiveNumber"
type="com.kroger.accounting.rem.util.TrimmedUppercaseString"
update="true"
insert="true"
column="INT_CMP_RET_ACC_NO"
/>

<property
name="divisionId"
type="java.lang.Long"
update="true"
insert="true"
column="REM_DIV_ID"
/>




<!--
To add non XDoclet property mappings, create a file named
hibernate-properties-RentChange.xml
containing the additional properties and place it in your merge dir.
-->

</class>

</hibernate-mapping>


can you please help me how to resolve this issue.

Thanks.