MS Access DB

create table testdefault1
( id integer not null primary key identity
, df integer not null default 42
, vf integer not null default 937
)

create table testdefault2
( id integer not null primary key identity
, df integer not null default 42
, vf integer not null default 937
, xx integer not null default (df * 10) + (vf * 10)
)
Error: The name 'df' is not permitted 
in this context. Only constants, expressions, or variables 
allowed here. Column names are not permitted. 
(State:37000, Native Code: 80)

create table testdefault3
( id integer not null primary key identity
, df integer not null default 42
, vf integer not null default 937
)
insert into testdefault3 ( df, vf ) values ( 3, 9 )
insert into testdefault3 ( df, vf ) values ( 3, 7 )
insert into testdefault3 ( df, vf ) values ( 9, 3 )
insert into testdefault3 ( df, vf ) values ( 0, 7 )

create view testdefault3view
as
select df, vf, (10*df)+(10*vf) as xx 
from testdefault3 

select * from testdefault3view

df vf xx
3 9 120
3 7 100
9 3 120
0 7 70