The method adds nothing but complexity to the model and it's implementations, and obscures meaning and interpretation.
The model will be simpler with the uid as an attribute in VERSION without secondary effects.
Also, remove the attribute from subclasses.
We could potentially modify the UML to look more like implementations. Need input from implementers.
We have always implementedthis as an attribute.
I have the uid also as an attribute (in an object that can be accessed by a getter method).
Also my implementation only supports ORIGINAL_VERSION.
I'm don't see how it makes sense to have VERSION.uid be a property which would be inherited into IMPORTED_VERSION, which doesn't have a uid attribute, but rather a method to get the uid from the connected ORIGINAL_VERSION.
others in the SEC recognise that the UML is not an exact match for code, but it is very close in PHP and C#, and close enough to what it would be in Java. The main point is that uid is a function in IMPORTED_VERSION and only a stored property in ORIGINAL_VERSION.