Hibernate Envers @ElementCollection on List java -

i want use @elementcollection on set of type list, this:

@elementcollection @collectiontable(name = "my_product", joincolumns = @joincolumn(name = "id_product")) private list<my_product> products = new arraylist<>(); 

after that, see hibernate generates following script sql:

create table hist_my_product ( rev number(10,0) not null, revtype number(3,0) not null, id_product number(19,0) not null, price number(10,0), primary key (rev, revtype, id_product) ); 

and if use set of type set, this:

@elementcollection @collectiontable(name = "my_product", joincolumns = @joincolumn(name = "id_product")) private set<my_product> products = new linkedhashset<>(); 

hibernate generates following script sql:

create table hist_my_product ( rev number(10,0) not null, revtype number(3,0) not null, id_product number(19,0) not null, setordinal number(10,0) not null, price number(10,0), primary key (rev, revtype, id_product, setordinal) ); 

so, see aditional field "setordinal" set of type set , not type list.

could explain case ? not change list fields set.

thanks in advance response.