#LyX 2.2 created this file. For more info see http://www.lyx.org/
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This is the child document 
\begin_inset Formula $2$
\end_inset

.
 It overwrites the macro 
\begin_inset Formula $A3$
\end_inset

 (should be 
\begin_inset Formula $AAA$
\end_inset

).
 
\begin_inset FormulaMacro
\renewcommand{\foo}{A3}
\end_inset


\begin_inset Formula 
\[
\foo\mbox{ should be }A3
\]

\end_inset


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