Layout block inside a bookpart block

[Barikavily]

> I'm not top posting.

% I wish to define layout properties for a bookpart block
% but it doesn't seem to work. 
% Lilypond says "\paper is necessary". 
% Am I missing something?

\version "2.16.2"

\paper { top-margin = 50 }
\layout { indent = 50 }

\bookpart {
        \paper { top-margin = 0 }  % Not working
        \layout { indent = 0 }     % Not working
        \score { c'1 }
        \score { d'1 }
        \score { e'1 }
}

% Same thing happens when replacing \bookpart by \book.