Version: Epsilon Core 1.2.0.201408251031

Instructions

Import the projects from the archive
Right click on org.eclipse.epsilon.linkMinimalExample —> Run the editor as an application
Create an empty project at the new eclipse instance
Right click in this project, create new —>examples—>example diagram

When the diagram is initialised drag 2 states in it (they are under the objects folder in palette) 
Connect those 2 states with the transition (it is under connections folder in palette)
Drag a function into the diagram and give it a name
Select the existing transition on the canvas go to its properties and select the function that you created previously.
That’s all the problem has been illustrated.

Extras

Expected behaviour: The transition’s label and transition name property should be automatically assigned to the function’s name and appear on the canvas.
Actual behaviour: The transition’s name in properties view is as expected but there is no label displayed at all for the transition on the canvas.

Possible assumption for the error: Based on example.gmfgraph the transition’s label is automatically placed under another figure when you generate the code that’s why it never shows.