ssrs 2008 parametri a cascata

Ti mancano i nomi delle colonne. Prova con:

SELECT 
' ' as Date_Lab_Test_Ordered, ' ' as Ordering_Provider, ' ' as Provider_Specialty, 
' ' as Provider_Contact, ' ' as Desc_of_Order, ' ' as Date_Order_Filled, 
' ' as Date_Receipt_Verified