Hi,
Try this :
SELECT T0.[DocNum], T0.[DocDate], T0.[DocTotal], T0.[DocStatus], T1.[ClgCode], T1.[Recontact], T1.[CntctSbjct], T1.[AttendUser], T1.[Details], T1.[CntctType] FROM OINV T0 left join OCLG T1 on t0.docentry = t1.docentry and T0.[ObjType] = T1.[DocType]
Thanks & Regards,
Nagarajan