Hi
Try this
SELECT Distinct T0.[CardName], T0.[CardCode], T0.PayMth,
T0.[DocDueDate], T0.[Canceled], T1.SumApplied,T2.CheckNum,
T1.[DocEntry]
FROM ORCT T0 INNER JOIN RCT2 T1 ON T0.DocNum = T1.DocNum
INNER JOIN RCT1 T2 ON T0.DocNum = T2.DocNum
WHERE T1.[DocEntry] In (SELECT Distinct [DocEntry] FROM RCT2 WHERE InvType = 13
Group By [DocEntry] having count([DocEntry]) > 1) AND T0.CheckSum > 0
ORDER BY T1.[DocEntry]