Activity Delete Webservice failed response

Request:

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
       xmlns:ns="urn:crmondemand/ws/activity/10/2004"
       xmlns:act="urn:/crmondemand/xml/activity">
        <soapenv:Header/>
         <soapenv:Body>
          <ns:ActivityNWS_Activity_Delete_Input>
            <act:ListOfActivity>
              <!--Zero or more repetitions:-->
              <act:Activity>
               <act:IntegrationId>ABHA-48JA3L</act:IntegrationId>
                                      </act:Activity>
                                   </act:ListOfActivity>
                              </ns:ActivityNWS_Activity_Delete_Input>
                           </soapenv:Body>
                      </soapenv:Envelope>

Response:

<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
  <SOAP-ENV:Body>
    <SOAP-ENV:Fault>
      <faultcode>SOAP-ENV:Server</faultcode>
      <faultstring>Cannot perform DeleteRecord on the business component &apos;Action&apos;(SBL-EAI-04421)</faultstring>
      <detail>
        <siebelf:siebdetail xmlns:siebelf="