Can not import Dependencies.scala from top level sbt in multiproject - sbt

Question

I have a commons project in sbt which needs some values stored in a Dependencies.scala.
.
├── build.sbt
├── project
│   └── Dependencies.scala
└── src
└── main
└── scala
commons/build.sbt
import Dependencies._
lazy val commons = (project in file("."))
.settings(
name := s"$msg commonsproject",
version := "1.0",
scalaVersion := "2.12.2"
)
commons/project/Dependencies.scala
object Dependencies {
val msg = "Hello world"
}
When I run sbt, I get the correct value for name
[info] Loading project definition from /mydata/workspace/multiproject/commons/project
[info] Set current project to Hello world commonsproject (in build file:/mydata/workspace/multiproject/commons/)
> name
[info] Hello world commonsproject
>
Now, I have integrated it in a top level sbt project.
├── build.sbt(top level)
├── commons
│   ├── build.sbt
│   ├── project
│   │   └── Dependencies.scala
│   └── src
│   └── main
├── project
│   └── build.properties
└── src
├── main
│   └── scala
└── test
└── scala
build.sbt
lazy val commons = (project in file("commons"))
.settings(
name := "subproject",
version := "1.0",
scalaVersion := "2.12.2"
)
lazy val root = (project in file("."))
.settings(
name := "rootproject",
version := "1.0",
scalaVersion := "2.12.2"
).aggregate(commons)
When I run sbt from the top level, it fails with the following error:
/mydata/workspace/multiproject/commons/build.sbt:1: error: not found: object Dependencies
import Dependencies._
^
/mydata/workspace/multiproject/commons/build.sbt:6: error: not found: value msg
name := s"$msg commonsproject",
^
sbt.compiler.EvalException: Type error in expression
[error] sbt.compiler.EvalException: Type error in expression
[error] Use 'last' for the full log.</pre>
Can anyone tell if it's possible to keep the Dependencies.scala in the common project and still be able to run it from a top level sbt ?
The goal would be to be able to run sbt either at the top level or in the subproject while keeping despendencies in each project.
Other design to achieve what I want is also welcome
Thank you
Here is the sample project https://github.com/ccheneson/multiproject

Answer 1

From the SBT 0.13 docs:
You cannot have a project subdirectory or project/*.scala files in the sub-projects. foo/project/Build.scala would be ignored.
In this case your Dependencies.scala file is being ignored because commons is a sub-project - that's why you can't access it.