Report not showing correct results

Question

I am new to SSRS.  Using SQL 2008, Visual Studio 2010 shell.
I have a stored procedure that when I execute it through SSMS, it returns the correct results.  However, when my report runs through SSRS (using the same stored procedure).  I get inconsistent results.
I've been able to narrow it down to a specific parameter in my report where I pass in Id's.  This particular parameter gets its values from a query and is setup to use multiple values.  I have focused on two ID's which together are giving
me problems. 
The IDs are !'" and
!!T.
When I ONLY select !'" the report returns the correct results.
When I ONLY select !!T the report return the correct results.
When I select !'" and !!T the report only return the results for !!T.
I have no clue why SSRS doesn't like this.  Any help would be appreciated.
jhoop

Answer 1

I created the specific function referenced in your link and it didn't help.
Function
CREATE FUNCTION [dbo].[c__SplitValues]
-- Add the parameters for the function here
@List nvarchar(2000)
,@SplitOn nvarchar(2000)
RETURNS
@RtnValue TABLE
-- Add the column definitions for the TABLE variable here
Id int identity(1,1)
,Value nvarchar(100)
AS
BEGIN
-- Fill the table variable with the rows for your result set
While(CHARINDEX(@SplitOn, @List) > 0)
BEGIN
INSERT INTO @RtnValue (value)
SELECT
VALUE = LTRIM(RTRIM(SUBSTRING(@List, 1, CHARINDEX(@SplitOn, @List) - 1)))
SET @List = SUBSTRING(@List, CHARINDEX(@SplitOn, @List) + LEN(@SplitOn), LEN(@List))
END
INSERT INTO @RtnValue (Value)
SELECT Value = LTRIM(RTRIM(@List))
RETURN
END
The line in my SQL statement where I use this function
AND TableName.UserId IN (SELECT Value FROM dbo.c__SplitValues(@UserId,','))
jhoop