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<soapenv:Body>
     <urn:create>
        <urn:sObjects xsi:type="urn1:FeedItem"> <!--Zero or more repetitions:-->
           <!--You may enter ANY elements at this point-->
           <Body>TEST MESAGE FROM PORTAL2</Body>
           <ParentId>a0L550000014TAy</ParentId>
        </urn:sObjects>
      <urn1:Secure_Communication__r>
 <Legacy_Secure_Communication_ID__c>982918</Legacy_Secure_Communication_ID__c>
       </urn1:Secure_Communication__r>
     </urn:create>
  </soapenv:Body>