Macro snippet with file option in a multi-pom project

The project is a multi pom project. In the main pom project, I declare the other pom like this :

   <modules>
        <module>../moduleA</module>
        <module>../moduleB</module>
   ...
   </modules>

To avoid duplicate code,I use the macro snippet in my documentation in modules A, B and Main. For convenient, the following syntax :

 %{snippet|id=myid|file=src/main/java/mypackage/File.java} 

.

When I build the site from each module A or B, all work fine. But when the site was generated from the main module, the snippet seem not work : All the pages who include a snippet's macros in A or B are not generated. I obtain the same problem if i do a simple site or a site:stage

The maven site work fine work include pictures and schemas of local documentation (in A et B). I try to use
the velocity macro and transform MyFile.apt to MyFile.apt.vm like these :

MyFile.apt.vm
%{snippet|id=myid|file=${basedir}/src/main/java/mypackage/File.java}.

It's fail too.

I use maven 2.1.0

Sorry for my poor english