Pls help me on the following sql select - I get an error message

Hi
I get an error : ODBC ERROR - Incorrect syntax near , from Crystal SQL
reports.
Your help is really appreciated
SELECT
National_Oxygen_Pte_Ltd_Customer_Budget."Customer No_",
National_Oxygen_Pte_Ltd_Customer_Budget."Item Category Code"
FROM
"nox"."dbo"."National Oxygen Pte Ltd$Customer Budget"
National_Oxygen_Pte_Ltd_Customer_Budget
WHERE
(National_Oxygen_Pte_Ltd_Customer_Budget
."Customer No_" ,
National_Oxygen_Pte_Ltd_Customer_Budget."Item Category Code") NOT IN (SELECT
National_Oxygen_Pte_Ltd_Sales Invoice_Line."Customer No_",
National_Oxygen_Pte_Ltd_Sales_Invoice_Li
ne."Item Category Code" FROM
"nox"."dbo"."National Oxygen Pte Ltd$Sales Invoice Line"
National_Oxygen_Pte_Ltd_Sales_invoice_li
ne WHERE
National_Oxygen_Pte_Ltd_Sales_invoice_li
ne."Shipment Date" >= {ts
'2005-03-01 00:00:00.00'} AND
National_Oxygen_Pte_Ltd_Sales_invoice_li
ne."Shipment Date" < {ts '2005-03-3
1
00:00:01.00'}Radha,
Why did you use , at the where condition?
National_Oxygen_Pte_Ltd_Custo=ADmer_Budg
et."Customer No_" ,
National_Oxygen_Pte_Ltd_Custom=ADer_Budg
et."Item Category Code")
Is this a column?