With the modeling tool's updated version, the Experimental Features option plays an important role in the Concept Modeling diagrams. When the option is enabled, you can create an Association Class between Class elements, create Phase elements, and create Role elements in your diagram.
To enable the experimental features option
- In the main-menu, select Options > Environment. The Environment Options dialog will open.
- Click on Concept Modeling. Set the Enable experimental features field to true.
 - Now you create an Association Class, a Phase element, and a Role element with no errors.
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