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Created attachment 284744 [details] illustration of the exception See forum topic : https://www.eclipse.org/forums/index.php/t/1105773/ Step to reproduce: 1. Create a uml model with a datatype. This datatype contains a Property typed with Integer (for example). 2. Create a Profile model, with a stereotype extending Element. 3. Create a Property inside the stereotype and typed it with the DataType created in the first model. 4. Save and defined -> you get an exception (the profile definition works fine with the UML Editor).