Use of //@copy-declaration in IDL files that are included by other IDL files

Hello everybody

I am seeing some odd behavior when I use the @copy-declaration directive in IDL files which are included in other IDL files. Here is an example:
Let's say I have the file  base.idl with the following content:

module IDL {
//@copy-declaration // A Data
struct A {
  double i;
};
}; // end module IDL

//@copy-declaration #include <QtCore/QMetaType>
//@copy-declaration Q_DECLARE_METATYPE(IDL::A);

and a file  extended.idl with this content:

#include "base.idl"

module IDL {
struct Container {
  A a;
};
}; // end module IDL

Simply running  rtiddsgen -language C++ -namespace base.idl, followed by rtiddsgen -language C++ -namespace extended.idl results in code that cannot be compiled as the @copy-declaration directive results having the respective fragments not only copied into "base.h, but also into the top part of extended.h, which starts like this (again, this is only the top part of the file):

/*
  WARNING: THIS FILE IS AUTO-GENERATED. DO NOT MODIFY.

  This file was generated from extended.idl using "rtiddsgen".
  The rtiddsgen tool is part of the RTI Connext distribution.
  For more information, type 'rtiddsgen -help' at a command shell
  or consult the RTI Connext manual.
*/

#ifndef extended_53651664_h
#define extended_53651664_h

#ifndef NDDS_STANDALONE_TYPE
    #ifdef __cplusplus
        #ifndef ndds_cpp_h
            #include "ndds/ndds_cpp.h"
        #endif
    #else
        #ifndef ndds_c_h
            #include "ndds/ndds_c.h"
        #endif
    #endif
#else
    #include "ndds_standalone_type.h"
#endif


#include <QtCore/QMetaType>

Q_DECLARE_METATYPE(IDL::A);

#include "base.h"


namespace IDL{

        
extern const char *ContainerTYPENAME;
        
// ...
}

As you can see, it appears that #include base.idl not only results in a  #include base.h, but it also somewho seems to trigger the inclusion of the code marked with @copy-declaration (well, I gess since extended.h is a header file, it technically is a declaration).

Could anybody tell me whether this is simply user error on my side and how to only get code copied into "base.h" ?

Thanks for your efforts.

Claus

PS: I pasted the full base.h at http://pastebin.com/rKZzRGdq and the full extended.h at http://pastebin.com/mGkVexXN. Furthermore, the two IDL files and the resulting code is also in the attached ZIP archive.