Hi Lukasz,
did you check the WS Developers Guide if there are any hints on how to create the SOAP Fault?
The structure might be dependent on SOAP version, IS version etc. being used.
Do you have WSDL and/or XSD available for this interface?
This might ease the creation of appropriate document types and web service descriptor nodes in Designer.
Regards,
Holger
#Integration-Server-and-ESB#webMethods