Hi,
Try:
SELECT T1.[DocNum], T1.[DocDate], T0.[ItemCode], T0.[Dscription], T0.[Quantity], T0.[StockPrice], T0.[DiscPrcnt],
T0.[Quantity] * T0.[stockprice] * (1 -T0.DiscPrcnt/100) as Total
FROM IGE1 T0 INNER JOIN OIGE T1 ON T0.DocEntry = T1.DocEntry
WHERE T0.[DocDate] >= '[%0]' and T0.[DocDate] <= '[%1]'
Thanks,
Gordon