In order to receive nice scripting features like the diagnose, which allows us to screen every element for it's meta model name and correlations, we need to open medini in the debug mode.
One way how to open medini via comand line is explained in the video attached.
PS: If you don't like command lines, you can also copy your existing shortcut and create a copy of it. At this copy you can simply add "-debug" to the target this will also open medini in debug mode.

Happy Scripting!
Joël