Hi,
Try this query:
SELECT distinct T0.[CardCode], T0.[CardName] as 'Custmer Name', T3.[Name] as 'State',T2.[GroupName] , T0.[Balance] as 'Balance' FROM OCRD T0 left JOIN CRD1 T1 ON T0.[CardCode] = T1.[CardCode] left JOIN OCRG T2 ON T0.[GroupCode] = T2.[GroupCode] left JOIN OCST T3 ON T1.[State] = T3.[Code] and T3.Country = T1.country WHERE T0.CardType = 'C' and T2.[GroupName] = [%0]
Thanks