Could someone tell me the reason why we would get this exception "org.hibernate.DuplicateMappingException: Duplicate collection role mapping"

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Initialization of bean failed; nested exception is org.hibernate.DuplicateMappingException: Duplicate collection role mapping com.elemica.api.component.account.AccountBean.accountBusinessRules
org.hibernate.DuplicateMappingException: Duplicate collection role mapping com.elemica.api.component.account.AccountBean.accountBusinessRules


Thanks
Sam

post the mapping files

AccountBean.hbm.xml
--------------------------

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
<class
name="com.elemica.api.component.account.AccountBean"
table="ACCOUNT"
schema="ELEMWSDEV"
>
<id
name="accountId"
type="long"
column="ACCOUNT_ID"
length="10"
>
<generator class="native">
<param name="sequence">ACCOUNT_ID</param>
</generator>
</id>
<property
name="accountName"
type="string"
column="ACCOUNT_NAME"
not-null="true"
length="256"
/>
<property
name="createdBy"
type="long"
column="CREATED_BY"
not-null="true"
length="38"
/>
<property
name="dateCreated"
type="timestamp"
column="DATE_CREATED"
not-null="true"
length="7"
/>
<property
name="statusId"
type="long"
column="STATUS_ID"
not-null="true"
length="22"
/>

<!-- Associations -->
<!-- bi-directional many-to-one association to AccountRoleTypeBean -->
<many-to-one
name="accountRoleType"
class="com.elemica.api.component.account.AccountRoleTypeBean"
cascade="none"
>
<column name="ROLE_TYPE" />
</many-to-one>
<!-- bi-directional many-to-one association to AccountBusinessRuleBean -->
<set
name="accountBusinessRules"
lazy="true"
inverse="true"
cascade="none"
>
<key>
<column name="ACCOUNT_ID" /> <!-- a foreign key in ACCOUNT_BUSINESS_RULES referencing the primary key of this table. -->
</key>
<one-to-many class="com.elemica.api.component.account.AccountBusinessRuleBean" />
</set>
<!-- bi-directional many-to-one association to AccountRelationshipBean -->
<set
name="accountRelationships"
lazy="true"
inverse="true"
cascade="none"
>
<key>
<column name="ACCOUNT_ID" /> <!-- a foreign key in ACCOUNT_RELATIONSHIP referencing the primary key of this table. -->
</key>
<one-to-many class="com.elemica.api.component.account.AccountRelationshipBean" />
</set>
<!-- bi-directional many-to-one association to AccountRelationshipBean -->
<set
name="accountReports"
lazy="true"
inverse="true"
cascade="none"
>
<key>
<column name="ACCOUNT_ID" /> <!-- a foreign key in ACCOUNT_REPORTS referencing the primary key of this table. -->
</key>
<one-to-many class="com.elemica.api.component.account.AccountReportBean" />
</set>
<!-- bi-directional many-to-one association to AccountRoleTypeBean -->
<set
name="accountRoleTypes"
lazy="true"
inverse="true"
cascade="none"
>
<key>
<column name="ROLE_TYPE" /> <!-- a foreign key in ACCOUNT_ROLE_TYPE referencing the primary key of this table. -->
</key>
<one-to-many class="com.elemica.api.component.account.AccountRoleTypeBean" />
</set>
<!-- bi-directional many-to-one association to AccountRoutingBean -->
<set
name="accountRoutings"
lazy="true"
inverse="true"
cascade="none"
>
<key>
<column name="ACCOUNT_ID" /> <!-- a foreign key in ACCOUNT_ROUTING referencing the primary key of this table. -->
</key>
<one-to-many class="com.elemica.api.component.account.AccountRoutingBean" />
</set>
<!-- bi-directional many-to-one association to AccountXrefBean -->
<set
name="accountXrefs"
lazy="true"
inverse="true"
cascade="none"
>
<key>
<column name="ACCOUNT_ID" /> <!-- a foreign key in ACCOUNT_XREF referencing the primary key of this table. -->
</key>
<one-to-many class="com.elemica.api.component.account.AccountXrefBean" />
</set>
<!-- bi-directional many-to-one association to AccoutMsgProcessingBean -->
<set
name="accoutMsgProcessings"
lazy="true"
inverse="true"
cascade="none"
>
<key>
<column name="ACCOUNT_ID" /> <!-- a foreign key in ACCOUT_MSG_PROCESSING referencing the primary key of this table. -->
</key>
<one-to-many class="com.elemica.api.component.account.AccoutMsgProcessingBean" />
</set>



</class>
</hibernate-mapping>

post AccountBusinessRuleBean map file

AccountBusinessRuleBean.hbm.xml
-----------------------------------------

Do you have any kind of inheritance in your pojos?