hi all..I have two table namely LoanProposal and BankLoanProposal with relation as

LoanProposal 1---*>BankLoanProposal .I was able to insert successfully and all the select query worked fine with join.But i have problem with updation .. I an newbie ..So please help me..Here are the
hbm file and .cfg file:

BankLoanProposal.hbm.xml:

<hibernate-mapping>
<class name="BankLoanProposal" table="bankloanproposal">
<id name="accountnumber" type="string" >
<generator class="assigned"/>
</id>
<property name="sequencenumber" type="integer"/>
<property name="loanperiod" type="integer"/>
<property name="interestrate" type="long"/>
<property name="interestapplfreq" type="integer"/>
<property name="intcalcmethod" type="integer"/>
<property name="compondfreq" type="integer"/>
<property name="fixedorfloating" type="string"/>
<property name="typeofloan" type="string"/>
<property name="securedunsecured" type="string"/>
<property name="securitytype" type="string"/>
<property name="status" type="string"/>
<property name="createdby" type="string"/>
<property name="createddate" type="date"/>
<property name="authorisedby" type="string"/>
<property name="authoriseddate" type="date"/>
</class>
</hibernate-mapping>

LoanProposal.hbm.xml:

<hibernate-mapping>
<class name="LoanProposal" table="proposals">
<id name="proposalnumber" type="string">
<generator class="assigned">
</generator>
</id>
<property name="bankid" type="integer"/>
<property name="letterreferencenumber" type="string"/>
<property name="dateofsubmission" type="date"/>
<property name="proposedloanamount" type="integer"/>
<property name="stagesofproposal" type="string"/>
<property name="dateofrejection" type="date"/>
<property name="reasonsforrejection" type="string"/>
<property name="loansanctionamount" type="integer"/>
<property name="sanctiondate" type="date"/>
<property name="remarks" type="string"/>
<property name="createdby" type="string"/>
<property name="createddate" type="date"/>
<property name="authorisedby" type="string"/>
<property name="authoriseddate" type="date"/>
<!-- ONE TO MANY MAPPING -->
<list name="bankloanproposal" cascade="all">
<key column="proposalnumber"/>
<list-index column="loanserialno" base="1"></list-index>
<one-to-many class="BankLoanProposal"/>
</list>

<!--MANY TO ONE MAPPING WITH BANKMASTER-->

<many-to-one class="BankMasterPojo" name="bankmasterpojo" column="BANKID" insert="false" update="false">

</many-to-one>
</class>
</hibernate-mapping>

please help me out....