Configuration containing another version of a project

Hello,

In the context of building the oldClasspath to give to japicmp-gradle-plugin, I am desesperately trying to build a configuration containing the previous version of my subproject.

Let’s suppose a multiproject with a pA subproject. In the rootProject build.gradle I have

subproject(':pA') {
  group = "com.xxx"
  name = "abc"
  version = '17'
  configurations {
    old
  }
  repositories {
    ..
  }
  dependencies {
    old "${group}:${name}:16"
  }

With this, the module definition is systematically replaced with my project…

$ ./gradlew :pA:dependencies --configuration old
Executing local gradle wrapper

> Task :pA:dependencies

------------------------------------------------------------
Project :pA
------------------------------------------------------------

old
\--- com.toto:pA:1.0 -> project :pA (*)

(*) - dependencies omitted (listed previously)

I found googling, that a detachedConfiguration could be used, but in that case:

subproject(':pA') {
  group = "com.xxx"
  name = "abc"
  version = '17'

  def conf = configurations.detachedConfiguration(
    dependencies.create("${group}:${name}:16")
  )

  tasks.register('printConf').configure {
    doLast {
      println files(conf).asPath
    }
  }
}

Then I have some error about ‘default’ configuration that I do not understand.

$ gradle :pA:printConf
Executing local gradle wrapper
> Task :pA:printConf FAILED

FAILURE: Build failed with an exception.

* Where:
Build file 'xxx/gradle_test/build.gradle' line: 62

* What went wrong:
Execution failed for task ':pA:printConf'.
> Could not resolve all files for configuration ':pA:detachedConfiguration1'.
   > Could not resolve com.toto:pA:1.0.
     Required by:
         project :pA
      > Project :pA declares a dependency from configuration 'detachedConfiguration1' to configuration 'default' which is not declared in the descriptor for project :pA.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

Is there a way to achieve building a configuration referencing another version of the current project?