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Step - 4 : Show labels in screens above the form like "New Person --- Simple Event"  and  "New Person --- Java Event" so that it will be easy to identify the purpose of that form.

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Step - 2 :  Now you have to create a file by name "eecas.xml" in "entitydef" directory, which will be in your component directory "practice". Eeca definition will come here. (Take reference from eecas.xml of "accounting" component). This will be :

    <!-- To create party role whenever a party is created -->
    <eca entity="Party" operation="create" event="return">
        <condition field-name="partyId" operator="is-not-empty"/>
        <action service="createPartyRoleCustomer" mode="sync"/>
    </eca>

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 Create a group service by name "partyGroup" like :

<!-- Group service - ->
    <service name="partyGroup" engine="group" auth="true">
        <description>Creates a party, person and party role Client</description>
        <group>
            <invoke name="createPracticePerson" result-to-context="true"/>
            <invoke name="createPartyRoleClient"/>
        </group>
    </service>

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Step - 3 : For loading the defintion you need to do an entry in your ofbiz-component.xml file like:

    <entity-resource type="model" reader-name="main" loader="main" location="entitydef/entitymodel.xml"/>

           That implies that when ever you do a change you need to restart the server to have those changes in effect.

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Step - 1 :  For extending an entity use

    <extend-entity entity-name="">
        <field name="" type=""/>
    </extend-entity>

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