plugins/projectmgr/entitydef/eecas.xml

<?xml version="1.0" encoding="UTF-8"?>
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<entity-eca xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="http://ofbiz.apache.org/dtds/entity-eca.xsd">

    <eca entity="WorkEffortPartyAssignment" operation="create" event="return">
        <condition field-name="statusId" operator="equals" value="PAS_ASSIGNED"/>
        <set field-name="noteParty" env-name="partyId"/>
        <set field-name="noteInfo" value="New task assignment"/>
        <set field-name="moreInfoItemName" value="workEffortId"/>
        <set field-name="moreInfoItemId" env-name="workEffortId"/>
        <set field-name="moreInfoUrl" value="/projectmgr/control/taskView"/>
        <action service="createSystemInfoNote" mode="sync"/>
    </eca>

</entity-eca>