[SQLObject] archive class

[<py...@to...>]

Hello,
Excuse my english, but I speak french or spanish only...

I want to copy some entries of an "orders"+"orders_entries" to an
"orders_archive"+"orders_entries_archive".
My existing classes have a lot of columns and additional "magic
attributes". My first idea was to make something like :

class Orders_entries(SQLObjects):
   class meta:
      table =3D "current_orders_entries"
   order =3D ForeignKey("current_orders")
   date =3D DateTimeCol()
   ...

# class Orders_entries_archive, only redefine the different attributes
class Orders_entries_archive(Orders_entries):
   class meta:
      table =3D "orders_entries_archives"
   order =3D ForeignKey("orders_archive")

But, I get an error message :
The class Orders_entries_archive already has a column orderID (<ForeignKe=
y
40813b4c order>), you cannot add the column (<ForeignKey 40813cec order>)

Any idea ?
Fran=E7ois