MDX Where with two itens value error

Question

Hello, I'm with a strange problem...
SELECT
{[Cliente].[Segmentos].[Segmento]}ON 1,
{ [Measures].[Valor Liq Item] } ON 0
FROM [Bright Cube]
WHERE ( { [Cliente].[Cliente].&[66471517000177] } )
This result is 9,946,052.03 (Correct)
SELECT
{[Cliente].[Segmentos].[Segmento]}ON 1,
{ [Measures].[Valor Liq Item] } ON 0
FROM [Bright Cube]
WHERE ( { [Cliente].[Cliente].&[13008312000193] } )
This result is 16,239,050.14 (Correct)
SELECT
{[Cliente].[Segmentos].[Segmento]}ON 1,
{ [Measures].[Valor Liq Item] } ON 0
FROM [Bright Cube]
WHERE ( { [Cliente].[Cliente].&[66471517000177], [Cliente].[Cliente].&[13008312000193] } )
This result is 286,976,802.29 (Wrong, this is the [All] value)
Any idea why this is happening?
I tried with others dimensions and hierarchies and the result is the same.
Also tried using UNION and +, but no effect.
Can't find much about it, maybe i'm searching wrong.
Any clue is welcome.
Thanks!

Answer 1

I was able to get the desired result like this:
SELECT
{[Cliente].[Segmentos].[Segmento]}ON 1,
{ [Measures].[Valor Liq Item] } ON 0
FROM ( SELECT { [Cliente].[Cliente].&[66471517000177], [Cliente].[Cliente].&[13008312000193] } ON 0 FROM [Bright Cube] )
Is sub query the best way to do it? 
The Where clause would only slice the entire hierarchy?