Sybase 16 and @table vars

We're having a look at Sybase 16 and the @table variables

This doesn't seem right to me

declare @a_table_var table( colA int, colB varchar(5), colC numeric(10,2) null )

insert @a_table_var (colA,colB,colC)   values( 1, 'OK', 945.32 )

insert @a_table_var (colA,colB)        values( 2, 'WRONG' )

insert @a_table_var (colA,colB,colC)   values( 3, 'OK', null )

select * from @a_table_var

colA     colB     colC   

-------  ------- -------

1        OK       945.32 

2        WRONG    945.32

3        OK       (null)