multi-module project and ${basedir} placeholder

Question

I have a multi module project with the following structure:

-parent
   -module1
   -module2
   -src
      -main
         -javadoc
             -stylesheet.css
   -pom.xml

I want to configure the javadoc plugin in the parent POM. But, I need to specify the path to the stylesheet.css file. So, I use the value ${basedir}\src\main\javadoc\stylesheet.css. But, when I look at the effective POM for the child modules, the ${basedir} is replaced by the absolute path of the child module base directory, but there is no src/main/javadoc/stylesheet.css file there. Copying the stylesheet.css file in the child modules is not a solution, I think.

Thanks