Attribute override for @GeneratedValue

It seems that there's no capability to override @GeneratedValue for subclass (of mapped superclass etc.) in JPA?
If this is correct then I can argue lack of design consistency. @AttributeOverride allows for column to be overwritten for property/field and @Id. If column for @Id can be overwritten, which implies different tables, then someone should assume possible sequence per table strategy. For legacy database this may be an issue.
I have seen suggestions to move id field/method to sublass, but it is a workaround. I shouldn't have to do something that I wouldn't normally do to accommodate use of Java Persistence API.
Any thoughts? Perhaps JPA specs group can look into it?

we do not want to calculate the value as user can enter any value as long as it is greater than the number of values in the VO's.
So the user can just enter 20 in the Textinput which means 20 people attended some class but they can enter only 10 people actually. So users dont have to enter all the information as sometimes it could be in hundreds like in conference. it is just for information purpose.
I want to use the value but not calculate it.
so am i doing right like mentioned in the previous thread?

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