HTTP Status Code 200 Received But Error During Response Parsing: No XI Response Received XML element {http://schemas.xmlsoap.org/soap/envelope/}Envelope missing in SOAP message header (SAP XI Extension)

Hi Experts,

We are testing file to proxy scenario in development system and its working fine earlier. But now we are faced HTTP 200 error as a shown below..I have searched blogs in SDN but did not get the resolution steps in my scenario.

<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>

<!--  Call Adapter  -->

<SAP:Error xmlns:SAP="http://sap.com/xi/XI/Message/30" xmlns:SOAP="http://schemas.xmlsoap.org/soap/envelope/" SOAP:mustUnderstand="">

  <SAP:Category>XIServer</SAP:Category>

  <SAP:Code area="INTERNAL">OK_BUT_NO_XI_MESSAGE</SAP:Code>

  <SAP:P1 />

  <SAP:P2 />

  <SAP:P3 />

  <SAP:P4 />

  <SAP:AdditionalText />

  <SAP:Stack>HTTP Status Code 200 Received But Error During Response Parsing: No XI Response Received XML element Envelope missing in SOAP message header (SAP XI Extension)</SAP:Stack>

  <SAP:Retry>M</SAP:Retry>

  </SAP:Error>

Previous resolution steps in SDN for same error.

1.File size----need to increase ffile size setting---But in my case we are using 20 kb file.

2.Path prefix---need to maintain path prefix in RFC destination---I have already did this one.

3.XI adapter---need to select xi 2.0 in message protocol in case of SAP ECC version below  6.0-- i have already did this one.

can you please provide other solution except above one.Thank you.

Regards,

Azeem