Hi,
You can use OPOR.UpdateDate field to get UpdateDate, or you can get it from ADOC table by link (OPOR.DocEntry = ADOC.DocEntry and OPOR.ObjectType = ADOC.ObjectType).
Try below query
select a.DocNum, b.ItemCode, b.Dscription, a.DocDate,
isnull((select MAX(t0.UpdateDate)
from dbo.ADOC t0 where t0.DocEntry = a.DocEntry and t0.ObjType = a.ObjType),a.UpdateDate) as UpdateDate
from dbo.OPOR a
inner join dbo.POR1 b on b.DocEntry = a.DocEntry
Thanks&Regards,
Alvin