updating cube using stored procedure

Hi , Please help me on the below sp

CREATE PROCEDURE [dbo].[USP_UpdateDataFromCube]
 @Customer_Id VARCHAR(50),
 @Sales_Amount VARCHAR(50)
AS
BEGIN

 SET NOCOUNT ON

 DECLARE @MDX_QUERY AS VARCHAR(MAX)
 DECLARE @OPEN_QUERY AS NVARCHAR(MAX)
 DECLARE @LINKED_SERVER AS VARCHAR(MAX)
 DECLARE @CUBE_NAME AS VARCHAR(MAX)

 SET @LINKED_SERVER='[DSV1-TestCube]'
 SET @CUBE_NAME='[DSV1-TestCube]'

 SET @MDX_QUERY='UPDATE [AdventureWorksDW2008R2].[dbo].[FactInternetSales]
 SET LinkedServerName='+@LINKED_SERVER+',
 CubeName='+@CUBE_NAME+',
 SalesAmount=(SELECT * FROM OPENQUERY('+@LINKED_SERVER+',
 ''SELECT {[MEASURES].[PRODUCT KEY],
 [MEASURES].[UNIT PRICE],
 [MEASURES].[SALES AMOUNT]} 
 ON AXIS(0),
 {[DIM CUSTOMER].[CUSTOMER KEY].&[11007]} 
 ON AXIS(1)
 FROM '+@CUBE_NAME+''')) FIS INNER JOIN [AdventureWorksDW2008R2].[dbo].[DimCustomer] DC 
 ON FIS.CustomerKey=DC.CustomerKey WHERE DC.CustomerKey='+@Customer_Id+'' 

 SET @OPEN_QUERY='UPDATE OPENQUERY("'+@LINKED_SERVER+'","'+@MDX_QUERY+'")'

EXEC(@OPEN_QUERY)
 SET NOCOUNT OFF
END
GO

as at the time of execution i am getting some error message like below "

Msg 103, Level 15, State 4, Line 1
The identifier that starts with 'UPDATE [AdventureWorksDW2008R2].[dbo].[FactInternetSales]
 SET LinkedServerName=[DSV1-TestCube],
 CubeName=[DSV1-TestC' is too long. Maximum length is 128.
Msg 102, Level 15, State 1, Line 1
Incorrect syntax near 'UPDATE [AdventureWorksDW2008R2].[dbo].[FactInternetSales]
 SET LinkedServerName=[DSV1-TestCube],
 CubeName=[DSV1-TestC'.

"