Hibernate @SecondaryTable() for both Parent and Child with the same name

Hibernate ORM
1

We have a requirement to insert to DB using Hibernate which has a Data model as below

@javax.persistence.Entity(name = "table1")
@SecondaryTable(name = "table2", pkJoinColumns = @PrimaryKeyJoinColumn(name = "fk2ObjId", referencedColumnName = "object_id"))
public class Parent {

}

@SecondaryTable(name = "table2", pkJoinColumns = @PrimaryKeyJoinColumn(name = "fk2ObjId", referencedColumnName = "object_id"))
public class Child extends Parent {

   @ManyToOne(optional = true, cascade = { CascadeType.PERSIST, CascadeType.MERGE, CascadeType.REFRESH }, fetch = FetchType.LAZY)
   @JoinColumn(table = "table2", name = "fk2RefId", nullable = true)
   private Reference reference = null;
}

Now when I try to insert data to table2 , I see insert statements as below

  1. insert into table1 – from Parent class
  2. insert into table2 – from Parent class
  3. insert into table2 – from child class

Unfortunately, as the fk2ObjId is the primary key, the insert at 2 and 3 will conflict for unique constraint violation which is obvious

Question: How let Child class know not to generate another insert statement and update the existing one?