Add a Message for Exception Handling
When you first create a port to the back-end system, it contains a request and a response. You must add a message so that you can assign it to the fault.
To add a fault message
In the Orchestration View window, right-click Messages, and then select New Message.
This creates Message_3, which you can assign specifically to the fault.
Right-click Message_3, and select Properties.
Set the Message Type as follows: select .NET Classes, and then select System,String