using Papyrus 7.3 on Helios I follow this procedure to create a diagram for an existing UML model:
-select the UML model in package explorer
-create Papyrus model with File->New->Papyrus Model, file name will be like the uml model but ending with .di
-open the created papyrus model in the papyrus perspective
-go to the papyrus model explorer
-right click on a uml package->new diagram->class diagram
-drag elements from the model explorer to the newly created diagram
I followed step by step your answer but it doesn't work for me.
After selecting the UML Model, I open the Papyrus New Model Wizard (File -> New -> Papyrus Model), and the file name corresponds already with the .di extension. But When I try to finish, the papyrus Wizard doesn't dispose.
If I cancel the operation, Papyrus creates a the model with the di extension but I tri to open it, the papyrus editor is blank.
I am using Eclipse Helios and Papyrus v7.3, on Linux .2.6.38. I hope this is not a bug from Papyrus.