How to invoke external fulfillment web service during Order Management orchestration process?

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Hi,

We are trying to incorporate external web service call during orchestration process.Below are the steps we have followed
1.We have created an integration by following the support document( Doc ID 2578377.1 )
2.We have configured this integration end point in "Manage External Interface Web service Details" task in setup and maintenance.
3.We have followed the support document( Doc ID 2579033.1 ) and completed the required setups.

But when we are getting below mentioned error while orchestration process:

01.01:An error occurred: remoteFault-com.oracle.bpel.client.BPELFault: faultName: {{http://schemas.oracle.com/bpel/extension}remoteFault} messageType: {{http://schemas.oracle.com/bpel/extension}RuntimeFaultMessage}