Problem with bulk update and inheritance

Employee and Customer are subclasses of Person (strategy "SINGLE_TABLE"). Both are entities.
I launch a bulk update to modify the salary of all the employees:
em.getTransaction().begin();
Query q = em.createQuery("update Employee e set e.salary = 2000");
int n = q.executeUpdate();
em.getTransaction().commit();
In the table PERSON, the column "salary" of all the lines, even the lines of the customers !, is modified to 2000.
Can you tell me whether it is a bug of TopLink or I have made an error?
I have used glassfish-persistence-installer-v2-b23.jar to install toplink-essentials.

I filed a new TopLink bug https://glassfish.dev.java.net/issues/show_bug.cgi?id=1448

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