update_list_one_item.xml

<soapenv:Envelope xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <soapenv:Header>
        <platformMsgs:documentInfo xmlns:platformMsgs="urn:messages_2015_1.platform.webservices.netsuite.com">
            <platformMsgs:nsId>WEBSERVICES_4094105_100420174020144521635732562_3cddd9b4c927</platformMsgs:nsId>
        </platformMsgs:documentInfo>
    </soapenv:Header>
    <soapenv:Body>
        <updateListResponse xmlns="urn:messages_2015_1.platform.webservices.netsuite.com">
            <writeResponseList>
                <platformCore:status isSuccess="true" xmlns:platformCore="urn:core_2015_1.platform.webservices.netsuite.com"/>
                <writeResponse>
                    <platformCore:status isSuccess="true" xmlns:platformCore="urn:core_2015_1.platform.webservices.netsuite.com"/>
                    <baseRef xsi:type="platformCore:RecordRef" type="inventoryItem" externalId="testing" internalId="624113" xmlns:platformCore="urn:core_2015_1.platform.webservices.netsuite.com"/>
                </writeResponse>
            </writeResponseList>
        </updateListResponse>
    </soapenv:Body>
</soapenv:Envelope>