Wrong Syntax In Where Smth In Case ?

Hello all,

I belive, my problem is probably very easy to solve, but still, I
cannot find solution:

declare @iint
declare @zint


create table bubusilala (
[bubu] [int] NOT NULL ,
[gogo] [int] NOT NULL ,
[lala] [varchar] (3) NOT NULL )

insert into bubusilala (bubu,gogo,lala) values (1,2,'ala')
insert into bubusilala (bubu,gogo,lala) values (10,20,'aca')
insert into bubusilala (bubu,gogo,lala) values (100,200,'bbb')
insert into bubusilala (bubu,gogo,lala) values (11,21,'ccc')
insert into bubusilala (bubu,gogo,lala) values (12,22,'abc')
insert into bubusilala (bubu,gogo,lala) values (13,23,'cbd')

set @i = 10
set @z = 2

select * from bubusilala
where bubu in (
case when @i > @z then (1,2)
when @i < @z then (10,13) end)
and gogo like '%a%'

I get error, that statement is wrong in case near ','.
I supose, it is not possible, to get from case a group of values.
But why then, this works:


select * from bubusilala
where bubu in (
case when @i > @z then (1)
when @i < @z then (select gogo from bubusilala) end)
and gogo like '%a%'

This data are totaly simplified.

agrh ... any ideas??

Thank You in advance,

Mateusz