SAP query returning duplicate records

Hi all,
I'll try to elaborate as much as possible so here goes:
I have a query that I am trying to run in SAP B1 8.8 which is not returning the true set of results I am expecting.
Essentially I am trying to filter by product based on delivery notes. I have the query as follows -
SELECT count(*), sum(T0.[DocTotal]-T0.[VatSum]) as "Order Value"
FROM ODLN T0 INNER JOIN OCRD T1 ON T0.CardCode = T1.CardCode
WHERE DateName(mm,T0.DocDate) = 'November'
and DateName(yyyy,T0.DocDate) = '2011'
and (T1.[GroupCode] = '102' or T1.[GroupCode] = '107')
This returns the correct result of 1320 row numbers and the given sum.
When I try to break this query down further by product using the query below, the values are doubled, tripled, quadrupled etc and summed up to give a number that is extremely high.
The code is as follows:
SELECT distinct count (*), sum(distinct T0.[DocTotal]-T0.[VatSum]) as "Order Value" from DLN1 T1
inner join ODLN T0 on T0.DocEntry = T1.DocEntry
Inner join OITM T2 on T2.ItemCode = T1.ItemCode
inner join OCRD T3 on T0.CardCode = T3.CardCode
WHERE DateName(mm,T0.DocDate) = 'November'
and DateName(yyyy,T0.DocDate) = '2011'
and (T3.[GroupCode] = '102' or T3.[GroupCode] = '107')
and (T2.[ItmsGrpCod] = '108' or T2.[ItmsGrpCod] = '112' or T2.[ItmsGrpCod] = '115')
This also returns 1819 rows where there should be less based on the product.
Please let me know if I am not explaining myself well or need further clarification.
Thanks!

hi,
try to run this code from your SQL management studio
SELECT     SUM(T0.DocTotal - T0.VatSum) AS [Order Value], T0.DocTotal - T0.VatSum AS [Order Value], T0.DocNum, T0.DocDate, T0.CardCode, T0.CardName, T0.DocTotal,
                      T1.ItemCode, T1.Dscription, T1.Quantity, T2.GroupCode, T3.ItmsGrpCod
FROM         ODLN AS T0 INNER JOIN
                      DLN1 AS T1 ON T0.DocEntry = T1.DocEntry INNER JOIN
                      OCRD AS T2 ON T0.CardCode = T2.CardCode INNER JOIN
                      OITM AS T3 ON T1.ItemCode = T3.ItemCode
GROUP BY T0.DocTotal - T0.VatSum, T0.DocNum, T0.DocDate, T0.CardCode, T0.CardName, T0.DocTotal, T1.ItemCode, T1.Dscription, T1.Quantity, T2.GroupCode,
                      T3.ItmsGrpCod
HAVING      (T2.GroupCode = 102 OR
                      T2.GroupCode = 107) AND (T3.ItmsGrpCod = 108 OR
                      T3.ItmsGrpCod = 112 OR
                      T3.ItmsGrpCod = 115) AND (T0.DocDate BETWEEN CONVERT(DATETIME, '2011-11-01 00:00:00', 102) AND CONVERT(DATETIME, '2011-11-17 00:00:00', 102))
regards,
Fidel

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