IDOC stuck in PI with Loop error ( R/3 - PI - SCM SNC scenario)

Question

Hi,
  I am sending a PO as an IDOC from R/3 to SNC, the receiver side configuration was made with XI adapter with HTTP protocol. I am getting the IDOC received in PI but with below error. Any help is highly appreciated.
Aso I am not sure if the receiver communication channel should be XI server host and url or SNC host.
<?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="1">
  <SAP:Category>XIServer</SAP:Category>
  <SAP:Code area="INTERNAL">LOOP_IN_MESSAGE_ROUTING</SAP:Code>
  <SAP:P1>is.23.saptest1</SAP:P1>
  <SAP:P2>CENTRAL</SAP:P2>
  <SAP:P3>XI</SAP:P3>
  <SAP:P4 />
  <SAP:AdditionalText>Loop in message flow found: system is.23.saptest1, pipeline CENTRAL with inbound adapter XI already processed (see hoplist header)</SAP:AdditionalText>
  <SAP:Stack />
  <SAP:Retry>M</SAP:Retry>
  </SAP:Error>
Thanks,
Menaga

Answer 1

Every one thanks for your reply, first I tried changing my communication channel parameters which I had the PI host name and port and now I changed to SCM host name and port with path prefix /sap/xi/engine/?type=entry...I got the below error.
<?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">CLIENT_SEND_FAILED</SAP:Code>
  <SAP:P1>404</SAP:P1>
  <SAP:P2>Not Found</SAP:P2>
  <SAP:P3>(See attachment HTMLError for details)</SAP:P3>
  <SAP:P4 />
  <SAP:AdditionalText />
  <SAP:Stack>Error while sending by HTTP (error code: 404, error text: Not Found) (See attachment HTMLError for details)</SAP:Stack>
  <SAP:Retry>A</SAP:Retry>
  </SAP:Error>
Thanks,
Menaga