MIDL2230
The documentation lists this name without a value.
Documented in Win32
[nocode] ignored for server side since "/server none" not specified Some DCE IDL compilers generate an error when the [ nocode ] attribute is applied to a procedure in an interface for which server stub files are being generated. Because the server must support all operations, [ nocode ] must not be applied to a procedure in this mode, or you must use the MIDL compiler switch /server none to explicitly specify that no server routines are to be generated.