Post from Chris as a guest
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There does not appear to be a way to flag a base class operation as being overridden in a subclass and thus cause the operation to be generated in base and sub-class when the code is generated. The only way I found to do this is to actually copy the method into the derived class. Sequence diagrams are capable of seeing base class methods when creating messages to their derived classes, it seems like this capability is not a far departure from what I am requesting.