Hi Meghanath...
Try This
select T1. Dscription,T1.docEntry,T1.Quantity,T1.Price ,
isnull(T2.LineText,'')
from OQUT T0 INNER JOIN QUT1 T1 ON T0.DocEntry = T1.DocEntry INNER JOIN
QUT10 T2 ON T1.DocEntry = T2.DocEntry where T1.DocEntry='590'
Regards
Kennedy