doxygen: Illegal command n as part of a title section

[himajin100000]

Hello, himajin100000 here!

When I build LibreOffice locally, I often get just a bit upset because 
of the following warnings. Less warning will give me less stress :-)

/cygdrive/c/build/instdir/sdk/include/cppuhelper/implbase1.hxx:245: 
warning: Illegal command n as part of a title section
/cygdrive/c/build/instdir/sdk/include/cppuhelper/implbase10.hxx:251: 
warning: Illegal command n as part of a title section
/cygdrive/c/build/instdir/sdk/include/cppuhelper/implbase11.hxx:252: 
warning: Illegal command n as part of a title section

I found the following ALIAS

https://opengrok.libreoffice.org/xref/core/odk/docs/cpp/Doxyfile?r=86c189cf#33

and Doxyfile for cpp on my local machine says

INPUT = /cygdrive/c/sources/libo-core/odk/docs/cpp/main.dox 
/cygdrive/c/sources/libo-core/include/sal/log-areas.dox 
/cygdrive/c/build/instdir/sdk/include/sal 
/cygdrive/c/build/instdir/sdk/include/salhelper 
/cygdrive/c/build/instdir/sdk/include/rtl 
/cygdrive/c/build/instdir/sdk/include/osl 
/cygdrive/c/build/instdir/sdk/include/typelib 
/cygdrive/c/build/instdir/sdk/include/uno 
/cygdrive/c/build/instdir/sdk/include/cppu 
/cygdrive/c/build/instdir/sdk/include/cppuhelper 
/cygdrive/c/build/instdir/sdk/include/com/sun/star/uno/Any.h 
/cygdrive/c/build/instdir/sdk/include/com/sun/star/uno/Any.hxx 
/cygdrive/c/build/instdir/sdk/include/com/sun/star/uno/genfunc.h 
/cygdrive/c/build/instdir/sdk/include/com/sun/star/uno/genfunc.hxx 
/cygdrive/c/build/instdir/sdk/include/com/sun/star/uno/Reference.h 
/cygdrive/c/build/instdir/sdk/include/com/sun/star/uno/Reference.hxx 
/cygdrive/c/build/instdir/sdk/include/com/sun/star/uno/Sequence.h 
/cygdrive/c/build/instdir/sdk/include/com/sun/star/uno/Sequence.hxx 
/cygdrive/c/build/instdir/sdk/include/com/sun/star/uno/Type.h 
/cygdrive/c/build/instdir/sdk/include/com/sun/star/uno/Type.hxx

When I get the intersection of INPUT and all the codes in opengrok which 
use @derive command, I got

https://opengrok.libreoffice.org/search?full=%22%40derive%22&path=%22%2Fcore%2Finclude%2Fcppuhelper%2F%22&project=core

https://opengrok.libreoffice.org/search?full=%27%40derive%27&path=%22%2Fcore%2Finclude%2Frtl%2F%22&project=core

, all of which are giving the similar errors.

http://www.doxygen.nl/manual/commands.html#cmdpar

says title follows @par command. Probably that par title does not accept 
@n is the cause of the warning.

Does anyone know the the correct syntax? I still haven't search for it.