No, there's no relation between odp.proj and odp.proj.subpackage from the Java language perspective.
For code, odp.proj.subpackage would reside in a sub directory of odp.proj, and some tools and IDE's might group them together in a UI, but regarding language access control, or other langage feature there's no relation.
Java does not have the concept of a subpackage, so odp.proj.subpackage and odp.proj are as different from each other as any other differently named packages.
