Thanks for your help, I tried both, removing the dependsOn and the DependencyManagement, but still:
FAILURE: Build failed with an exception.
* What went wrong:
Could not resolve all dependencies for configuration ':compileClasspath'.
> Could not find org.camunda.bpm.webapp:camunda-webapp-ee-plugins:23.5.6.
Required by:
project :
Which is correct, because 23.5.6 does not exist, I took that as default to notice at once when it is applied.