Line Num in POR1

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Dear Experts,

I have made a simple purchasing report.

SELECT T0.[CardCode] as 'Vendor No.', T0.[CardName] as 'Vendor Name', T2.[SlpName] as 'Buyer',
T0.[DocNum] as 'PO No.', T1.[LineNum] as 'Line No.', T1.[ItemCode], T1.[U_Quote] as 'Purchase Item Description',
T1.[Quantity] as 'Qty Ordered', T1.[OpenQty] as 'Open Qty', T1.[Price] as 'Unit Price', T0.[DocDate] as 'Document Date',T0.[DocDueDate] as 'Receiving Date', T1.[U_Ship_Date] as 'Ship Date' FROM OPOR T0 INNER JOIN POR1 T1 ON T0.DocEntry = T1.DocEntry INNER JOIN OSLP T2 ON T0.SlpCode = T2.SlpCode WHERE T0.[DocStatus] = 'O' GROUP BY T0.[CardCode], T0.[CardName], T2.[SlpName], T0.[DocNum], T1.[LineNum], T1.[ItemCode], T1.[Dscription], T1.[U_Quote], T1.[Quantity], T1.[OpenQty], T1.[Price], T0.[DocDate],
T0.[DocDueDate],T1.[U_Ship_Date] ORDER BY T0.[CardName], T1.[U_Quote]

I have even included line number but what exactly it is picking up m not getting.

I thought logicaly what it should pick up it if there are 3 items in one purchase order than it will/should show line num
0,1,2 but it is not.

My concern is what exactly is line num for?

Thanks-
Mona.