HideSOAPFault : Gateway

Cordys Version : BOP4.1CU6

com.cordys.gateway.strip.soapfault.detail=true;
and then restart the gateway and also the monitor since you will be keeping this in cordys properties.
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Cordys Version : BOP4.2

To Strip all the SOAP Faults
gateway.fault.blacklist=Cordys.CWS.Messages.*

TO Strip Only a particular SOAP Fault 
gateway.fault.blacklist=Cordys.CWS.Messages.<SOAPFaultMsgIdentifier>
Where 
<SOAPFaultMsgIdentifier> can be obtained from SOAP:fault section
Ex: gateway.fault.blacklist=Cordys.CWS.Messages.commitTransactionFailedWithReason