Multiple project dependencies in SBT native packager

Multiple project dependencies in SBT native packager

I am using the SBT native packager plugin for a project including multiple
modules.
In my SBT settings I have:
lazy val settings = packageArchetype.java_application ++ Seq(
...
// Java is required to install this application
debianPackageDependencies in Debian ++= Seq("java2-runtime"),
// Include the module JAR in the ZIP file
mappings in Universal <+= (packageBin in Compile) map { jar =>
jar -> ("lib/" + jar.getName)
}
)
The problem is that the generated ZIP, or DEB for example, do not seem to
include my project's modules dependencies. There is only the final module
JAR, and the libraries used in it, but not the modules that it depends on.
Do you know how could I fix that?