My aging Summary in System Currency does not match BP SC Currency..

So I tested out my query and it does not match exactly.. should it not match exactly what is in the BP for SC Balance? SELECT CardCode, CardName, PymntGroup, SUM(Balance) BALANCE, SUM(A) FUTURE, SUM(B) '0-30', SUM(C) '31-60', SUM(D) '61-90', SUM(E) '91-120', SUM(F) '121+' FROM ( SELECT T1.CardCode, T1.CardName, T2.[PymntGroup], T0.RefDate, T0.Ref1 'Document_Number',     CASE  WHEN T0.TransType=13 THEN 'Invoice'           WHEN T0.TransType=14 THEN 'Credit Note'           WHEN T0.TransType=30 THEN 'Journal'           WHEN T0.TransType=24 THEN 'Receipt'           END AS 'Document_Type',     T0.DueDate, (T0. [BalScDeb]- T0.[BalScCred]) 'Balance'     ,ISNULL((SELECT T0.[SYSDeb] - T0.[SYSCred] WHERE DateDiff(day, T0.DueDate, getdate())=0 and DateDiff(day, T0.DueDate,getdate())30 and DateDiff(day, T0.DueDate,getdate())60 and DateDiff(day, T0.DueDate,getdate())90 and DateDiff(day, T0.DueDate,getdate())=121),0) 'F' FROM JDT1 T0 INNER JOIN OCRD T1 ON T0.ShortName = T1.CardCode Left outer join  OCTG T2 On T1.GroupNum = T2.GroupNum WHERE  T1.CardType = 'C'  and BalSccred + balscdeb <>0 ) T100 GROUP BY CARDCODE, CARDNAME, PymntGroup ORDER BY CARDCODE