specialpurpose/ecommerce/widget/ForumTrees.xml

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

    <tree name="ResponseTree" root-node-name="node-root"
        default-render-style="simple" default-wrap-style="responseTreeWrapper">
        <node name="node-root" >
            <entity-one entity-name="Content"  use-cache="false" value-field="rsp">
                <field-map field-name="contentId" from-field="parameters.threadContentId"/>
            </entity-one>
            <include-screen name="responseTreeLine" location="component://ecommerce/widget/ForumScreens.xml"/>
            <sub-node node-name="node-body">
                <entity-condition entity-name="ContentAssocViewTo" use-cache="false" >
                    <condition-list combine="and">
                        <condition-expr field-name="contentIdStart" operator="equals" from-field="rsp.contentId"/>
                        <condition-expr field-name="caContentAssocTypeId" operator="equals" value="RESPONSE"/>
                        <condition-expr field-name="caFromDate" operator="less-equals" from-field="nowTimestamp"/>
                        <condition-list combine="or">
                            <condition-expr field-name="caThruDate" operator="equals"/>
                            <condition-expr field-name="caThruDate" operator="greater" from-field="nowTimestamp"/>
                        </condition-list>
                    </condition-list>
                    <order-by field-name="caFromDate DESC"/>
                </entity-condition>
            </sub-node>
        </node>
        <node name="node-body" entry-name="rsp">
            <include-screen name="responseTreeLine" location="component://ecommerce/widget/ForumScreens.xml"/>
            <sub-node node-name="node-body">
                <entity-condition entity-name="ContentAssocViewTo" use-cache="true" >
                    <condition-list combine="and">
                        <condition-expr field-name="contentIdStart" operator="equals" from-field="rsp.contentId"/>
                        <condition-expr field-name="caContentAssocTypeId" operator="equals" value="RESPONSE"/>
                        <condition-expr field-name="caFromDate" operator="less-equals" from-field="nowTimestamp"/>
                        <condition-list combine="or">
                            <condition-expr field-name="caThruDate" operator="equals"/>
                            <condition-expr field-name="caThruDate" operator="greater" from-field="nowTimestamp"/>
                        </condition-list>
                    </condition-list>
                    <order-by field-name="caFromDate DESC"/>
                </entity-condition>
            </sub-node>
        </node>
    </tree>

</trees>