Hi,
Try and let me know result:
SELECT
T0.[DocNum],
T3.[CardCode],
T3.[CardName],
T3.[Currency],T0.[CardCode], T0.[DocCur]
FROM OIPF T0
INNER JOIN IPF1 T1 ON T0.DocEntry = T1.DocEntry
INNER JOIN OITM T2 ON T1.ItemCode = T2.ItemCode
INNER JOIN OCRD T3 ON T2.CardCode = T3.CardCode
WHERE T0.[DocNum] =551728
GROUP BY T0.[DocNum], T3.[CardCode], T3.[CardName], T3.[Currency],T0.[CardCode], T0.[DocCur]