Fault message type for RFC_READ_TABLE

Hi Folks,

Have anyone tried configuring Fault Message Type for RFC_READ_TABLE in SAP PI/PO. I see the Fault message type in the "RFC_READ_TABLE" when I import it into PO but when I try to configure it in the inbound/outbound interface its not letting me configure the Exception structure in the fault message type. FYI I am already going through the following blog which doesn't have this issue that I have.

Handling Web Service SOAP Fault Responses in SAP NetWeaver XI

Regards

Kalyan.