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The Is SOAP Fault? is a pre-configured instance of the Content Validation filter. For convenience purposes, it contains a pre-configured XPath expression that simply checks for the <soap:Fault> element. The XPath expression is:
/soap:Envelope/soap:Body/soap:Fault
This filter should not need to be configured since its sole purpose is to check to make sure if the message is a SOAP Fault. However, you can change the XPath expression if necessary. For more information on configuring XPath expressions, see the Content validation topic.