Calling a OSB service(Service Type: Any XML Service) from BPEL

Recently i had question in an Interview:
How can a OSB service (of Service Type: Any XML Service) can be called from a BPEL service ?
This OSB service is not exposed as a WSDL.
Protocol: http
Endpoint URI: /TestOSBProject1/ps/SyncReadPS
host: localhost
port: 7001
URL: http://localhost:7001/TestOSBProject1/ps/SyncReadPS
When i hit this URL i am getting the message --> "This XML file does not appear to have any style information associated with it. The document tree is shown below."
WSDLURL: http://localhost:7001/TestOSBProject1/ps/SyncReadPS?WSDL
When i hit this URL i am getting the message --> "Error 500 - Internal Service Error -- This service is not associated to a WSDL"
Is there any way yo invoke this service from BPEL?

Thanks for your instance response.
I had used HTTP Binding adapter in BPEL (with GET).
Getting below error:
Unable to invoke endpoint URI "http://localhost:7001/TestOSBProject1/ps/SyncReadPS" successfully due to: javax.xml.ws.WebServiceException: java.lang.ClassCastException: oracle.j2ee.ws.mdds.ArrayPrototypeImpl cannot be cast to oracle.webservices.mdds.AtomicPrototype
Copied the reference (Http binding) from Composite.xml
<reference name="InvokeOSB" ui:wsdlLocation="InvokeOSB.wsdl">
    <interface.wsdl interface="http://xmlns.oracle.com/pcbpel/adapter/http/AdapterSOAProjectApplication/AdapterSOAProject/InvokeOSB#wsdl.interface(Request_Response_ptt)"/>
    <binding.ws port="http://xmlns.oracle.com/pcbpel/adapter/http/AdapterSOAProjectApplication/AdapterSOAProject/InvokeOSB#wsdl.endpoint(InvokeOSB/Request_Response_pt)"
                location="InvokeOSB.wsdl" supports="http">
      <property name="http.verb" type="xs:string" many="false">GET</property>
      <property name="endpointURI" type="xs:string" many="false">http://localhost:7001/TestOSBProject1/ps/SyncReadPS</property>
      <property name="http.payload" type="xs:string" many="false">url-encoded</property>
    </binding.ws>
</reference>
Please help me to resolve this.

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