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A CountedUnit has exactly 1 subUnit, while IndependentUnit, SequentialUnit and PriorityUnit have any number (0..*) of subUnits. This is confusing and a TransformationUnit without any subUnits also makes no sense at all. This should be changed to (1..*) subUnits for IndependentUnit, SequentialUnit and PriorityUnit.
This is intentional.