Hi Vishnu.
PI is getting the response with envelope having header & body.it is because of PI Calling webservice using SSL & https.
the response message with the header envelope is as below. I have not included the body here.
XML Validation Inbound Channel Response -->
soapenv:Envelope xmlns:env="http://schemas.xmlsoap.org/soap/envelope/" xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
<env:Header xmlns:wsa="http://www.w3.org/2005/08/addressing" xmlns:env="http://schemas.xmlsoap.org/soap/envelope/">
<wsa:MessageID xmlns:wsa="http://www.w3.org/2005/08/addressing" xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:env="http://schemas.xmlsoap.org/soap/envelope/">urn:b1f66ceb-681f-11e5-b672-005056a34094</wsa:MessageID>
<wsa:ReplyTo xmlns:wsa="http://www.w3.org/2005/08/addressing" xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:env="http://schemas.xmlsoap.org/soap/envelope/">
<wsa:Address>http://www.w3.org/2005/08/addressing/anonymous</wsa:Address>
<wsa:ReferenceParameters>
<instra:tracking.ecid xmlns:instra="http://xmlns.oracle.com/sca/tracking/1.0">b7647c42-8af3-4d09-b9b8-8cf801dbb837-0001177b</instra:tracking.ecid>
<instra:tracking.FlowEventId xmlns:instra="http://xmlns.oracle.com/sca/tracking/1.0">1633339</instra:tracking.FlowEventId>
<instra:tracking.FlowId xmlns:instra="http://xmlns.oracle.com/sca/tracking/1.0">290171</instra:tracking.FlowId>
<instra:tracking.CorrelationFlowId xmlns:instra="http://xmlns.oracle.com/sca/tracking/1.0">0000L0YkK_Z52jtawdfd6G1M2tC50000PJ</instra:tracking.CorrelationFlowId>
</wsa:ReferenceParameters>
</wsa:ReplyTo>
<wsa:FaultTo xmlns:wsa="http://www.w3.org/2005/08/addressing" xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:env="http://schemas.xmlsoap.org/soap/envelope/">
<wsa:Address>http://www.w3.org/2005/08/addressing/anonymous</wsa:Address>
</wsa:FaultTo>
</env:Header>
Regards.
Jagdish.