We have the following class hierarchy:
entity A extends from B (mapped superclass).
AccessType is PROPERTY.

class A defines a method getTest() which is overriden in class B.

This causes the following exception:

Caused by: org.hibernate.MappingException: Duplicate property mapping of testA found in sample.entities.B
at org.hibernate.mapping.PersistentClass.checkPropertyDuplication(PersistentClass.java:515)
at org.hibernate.mapping.PersistentClass.validate(PersistentClass.java:505)
at org.hibernate.mapping.RootClass.validate(RootClass.java:270)
at org.hibernate.cfg.Configuration.validate(Configuration.java:1360)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1851)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:85

the attached zip contain a testcase.