Why is the GROUP BY clause not working in my Query?

Question

Dear All,
Below is the Query for a Summary Debtors Aged Analysis.
The GROUP BY clause does not seem to be working.
The Query returns all the unpaid invoices, instead of a single total row for each Customer.
If a Customer X has 10 unpaid invoices, 10 rows are displayed - one for each invoice.
I was expecting only 1 row for Customer X, 1 for Customer Y, etc.
This is what GROUP BY is supposed to do, but it is not doing its work.
What has gone wrong?
Thanks
Leon Lai
Here's my Query:
declare @taxdt datetime
set @taxdt
/*select 1 from jdt1 t0 where t0.TaxDate*/ = [%1]
SELECT
CASE
             WHEN T0.Account = 1220101 THEN 'Prim Cust'
             WHEN T0.Account = 1220102 THEN 'Fgn Cust'
             WHEN T0.Account = 1220103 THEN 'Local Cust'
             WHEN T0.Account = 1220104 THEN 'Staff Loan' 
             WHEN T0.Account = 1220105 THEN 'Dep with TP'
             WHEN T0.Account = 1220106 THEN 'Adv to Cust'
             WHEN T0.Account = 1220108 THEN 'Sund Drs'
             ELSE 'Error ! ! !'
END AS 'Control A/c',
T1.CardCode AS 'BP Code',
T2.Notes2 AS 'BP Name',
SUM ((T0.Debit - T0.Credit)) AS 'Orig. Rs',       
SUM ((T0.BalDueDeb - T0.BalDueCred)) AS 'Bal. Rs',     
((SELECT SUM(T0.BalDueDeb) - Sum(T0.BalDueCred)
    WHERE DateDiff(mm, T0.TaxDate, @taxdt) = 1))    
    AS '1 Mth Ago' 
/* Similarly for other age brackets*/
FROM JDT1 T0
INNER JOIN OCRD T1 ON T0.ShortName = T1.CardCode
LEFT OUTER JOIN OCPR T2 ON T1.CardCode = T2.Cardcode
LEFT OUTER JOIN OJDT T3 ON T0.TransID = T3.TransID
LEFT OUTER JOIN OINV  T4 ON T3.TransID = T4.TransID
LEFT OUTER JOIN ORIN  T5 ON T3.TransID = T5.TransID
WHERE
T1.CardType = 'C'
and (Balance) != 0
and (T0.BalDueDeb - T0.BalDueCred) != 0
GROUP BY T0.Account, T1.CardCode, T2.Notes2, T0.TaxDate

Answer 1

Dear Neetu,
Thanks for your reply.
This Query is a modification of the Query you posted in SAP B1 SQL TIPS & TRICKS
http://wiki.sdn.sap.com/wiki/display/B1/SAPB1SQLB-FNDebtorsAgingReportbydate
So, maybe instead of referring to my Query, let's refer to yours. It may be easier for you to understand me.
Once I understand the problem, I can adapt your query to suit my requirements
So, let's start with a clean slate:
The Query you have posted is for a DETAILED Debtors Aging Report.
This lists all outstanding invoices, and ages them in the Age Brackets.
What I want is a SUMMARY Debtors Aging Report.
This will give the total amount owed by each Customer, and this amount is broken down in the Age Bracket Columns
There will be a single row listed for each customer, something like this:
Customer     Total Due     Current      1 Mth          2 Mth         3 Mth  etc
Alfred       500,000       300,000       200,000
Charles      800,000                     100,000       300,000       400,000
How can you modify your query to make it become a Summary Report (1 line for each customer even if he has many invoices)?
Thanks
Leon Lai
Here's your code
SELECT T1.CardCode, T1.CardName, T1.CreditLine, 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.Debit- T0.Credit) 'Balance'
     ,ISNULL((SELECT T0.Debit-T0.Credit WHERE DateDiff(day, T0.DueDate,'[%1]')<=-1),0) 'Future'
     ,ISNULL((SELECT T0.Debit-T0.Credit WHERE DateDiff(day, T0.DueDate,'[%1]')>=0 and DateDiff(day, T0.DueDate,'[%1]')<=30),0) 'Current'
     ,ISNULL((SELECT T0.Debit-T0.Credit WHERE DateDiff(day, T0.DueDate,'[%1]')>30 and DateDiff(day, T0.DueDate,'[%1]')<=60),0) '31-60 Days'
     ,ISNULL((SELECT T0.Debit-T0.Credit WHERE DateDiff(day, T0.DueDate,'[%1]')>60 and DateDiff(day, T0.DueDate,'[%1]')<=90),0) '61-90 Days'
     ,ISNULL((SELECT T0.Debit-T0.Credit WHERE DateDiff(day, T0.DueDate,'[%1]')>90 and DateDiff(day, T0.DueDate,'[%1]')<=120),0) '91-120 Days'
     ,ISNULL((SELECT T0.Debit-T0.Credit WHERE DateDiff(day, T0.DueDate,'[%1]')>=121),0) '121+ Days'
FROM JDT1 T0 INNER JOIN OCRD T1 ON T0.ShortName = T1.CardCode
WHERE (T0.MthDate IS NULL OR T0.MthDate > [%1]) AND T0.RefDate <= [%1] AND T1.CardType = 'C'
ORDER BY T1.CardCode, T0.DueDate, T0.Ref1