RS 2005: Stored Procedure With Parameter It Runs In The Data Tab But The Report Parameter Is Not Passed To It

Hello,
since a couple of days I'm fighting with RS 2005 and the Stored Procedure.

I have to display the result of a parameterized query and I created a SP that based in the parameter does something:

SET ANSI_NULLS ON
SET QUOTED_IDENTIFIER ON
CREATE PROCEDURE [schema].[spCreateReportTest]
@Name nvarchar(20)= ''

AS
BEGIN

declare @slqSelectQuery nvarchar(MAX);

SET NOCOUNT ON
set @slqSelectQuery = N'SELECT field1,field2,field3 from table'
if (@Name <> '')
begin
set @slqSelectQuery = @slqSelectQuery + ' where field2=''' + @Name + ''''
end
EXEC sp_executesql @slqSelectQuery
end

Inside my business Intelligence Project I created:
-the shared data source with the connection String
- a data set :
CommandType = Stored Procedure
Query String = schema.spCreateReportTest
When I run the Query by mean of the "!" icon, the parameter is Prompted and based on the value I provide the proper result set is displayed.

Now I move to "Layout" and my undertanding is that I have to create a report Paramater which values is passed to the SP's parameter...
So inside"Layout" tab, I added the parameter: Name
allow blank value is checked and is non-queried

the problem is that when I move to Preview -> I set the value into the parameter field automatically created but when I click on "View Report" nothing has been generated!!

What is wrong? What I forgot??

Thankx for any help!
Marina B.