How to get data from function?

set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go

ALTER FUNCTION [dbo].[getitemsavailableqtywithdatets] 
(@ItemNo VARCHAR(20), 
@Location VARCHAR(10), 
@Date DATETIME) 
RETURNS TABLE 
AS 
-- Declare the return variable here 
RETURN 
SELECT * 
FROM (SELECT Isnull(Sum(Quantity),0), 
@ItemNo AS [Item No_] 
FROM dbo.[Main-db$Item Ledger Entry] WITH (NOLOCK) 
WHERE [Item No_] = @ItemNo 
AND [Entry Type] = 0 
UNION ALL 
SELECT Isnull(Sum(tse.Quantity),0), 
@ItemNo AS [Item No_] 
FROM dbo.[Main-db$Trans_ Sales Entry] tse WITH (NOLOCK) 
LEFT OUTER JOIN dbo.[Main-db$Trans_ Sales Entry Status] tses WITH (NOLOCK) 
ON tses.[Store No_] = tse.[Store No_] 
AND tses.[POS Terminal No_] = tse.[POS Terminal No_] 
AND tses.[Transaction No_] = tse.[Transaction No_] 
AND tses.[Line No_] = tse.[Line No_] 
WHERE tse.[Item No_] = @ItemNo 
AND (tses.[Item No_] IS NULL 
OR tses.Status = 0)) t(salesqty,[Item No_])