Where is a simple example of using a service callout?

Question

I am using the oracle service bus and am need to obtain the result string from a webservice.
1)
I am using a service callout in one of the stages:
Service Callout to D2L Webservices invoking getOrgRole
Configure Payload Document is checked
Request Document Variable:      $body
Response Document Variable: $body
SOAP Request Header:      
SOAP Response Header:
Request Action Assign $body/enterprise/person/sourcedid/id/text() to variable inData
Response Action:
2) I need to configure the payload so $body/enterprise/person/sourcedid/id/text() is passed to the Request Document Variable. How do I do that?
3) what do I use to get the retrun string from the webservice?
4) I am getting a BEA-382500 error.
<con:reason>
     OSB Service Callout action received SOAP Fault response
     </con:reason>
     <con:details>
     <con1:ReceivedFaultDetail      xmlns:con1="http://www.bea.com/wli/sb/stages/transform/config">
     <con1:faultcode      xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">soapenv:Client</con1:faultcode>
     <con1:faultstring>Cannot find dispatch method for {}</con1:faultstring>
5) where is a simple example of calling a webservice from a message flow in oracle service bus?

Answer 1

3) what do I use to get the retrun string from the webservice?If the web service call is successful, the response is stored in the context variable *$body*
4) I am getting a BEA-382500 error.
<con:reason>
     OSB Service Callout action received SOAP Fault response
     </con:reason>
     <con:details>
     <con1:ReceivedFaultDetail      xmlns:con1="http://www.bea.com/wli/sb/stages/transform/config">
     <con1:faultcode      xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">soapenv:Client</con1:faultcode>
     <con1:faultstring> Cannot find dispatch method for {} </con1:faultstring>Looks like there is a problem in the operation you are trying to invoke via the business service. Also please verify the exact message going out of the wire to the Backend Webservice.
Are yo able to invoke the backend service directly from soapUI or similar tool? If yes, you can enable tracing on the Business service and capture the request sent out from OSB and compare the same with the one that works in soapUI. This should lead you to the exact issue.
5) where is a simple example of calling a webservice from a message flow in oracle service bus?Please refer to http://www.oracle.com/technetwork/middleware/service-bus/osbsamples-085201.html for the samples.
Hope this helps.
Thanks,
Patrick