sql sum() causing doubling of values with left outer join - sql

Question

The left out join on dbo.SalespersonProject is causing the value for TranAmt to double. I need to sum the legit TranAmt for projects, but adding in the left outer join and SalesPerson02, causes a match an incorrect doubling.
SELECT ARDoc.SlsperId AR_Doc_Sls_ID
, CASE
WHEN ARTran.TranType = 'CM' THEN SUM(ARTran.TranAmt) * -1
ELSE SUM(ARTran.TranAmt)
END TranAmt
, MAX(CASE
WHEN SalesCommOrder = 1 THEN SalesPersonId
END) Salesperson01
, MAX(ISNULL(CASE
WHEN SalesCommOrder = 1 THEN Percentage
END, .03)) Commission01
, MAX(CASE
WHEN SalesCommOrder = 2 THEN SalesPersonId
END) Salesperson02
, MAX(CASE
WHEN SalesCommOrder = 2 THEN Percentage
END) Commission02
, PJPROJ.project PJ_ID
, PJPROJ.project_desc PJ_Description
, PJPROJ.slsperid SME
, ARDoc.CustId Cust_ID
, CASE
WHEN RTRIM(ARTran.InvtId) = 'GRAPHICS' THEN 1
WHEN RTRIM(ARTran.InvtID) = 'SERVICE CONTRACT' THEN 2
END InvtID
, RTRIM(ARDoc.CustId) + ' ' + Customer.BillName Cust_ID_Name
, CONVERT( DATE, ARTran.TranDate, 101) Doc_Date
, ARTran.TranType Doc_Type
, ARTran.RefNbr
, PJPROJ.start_date
, SUM(ARTran.ExtCost) ExtCost
, SUM(ARTran.UnitPrice) UnitPrice
, SUM(ARTran.Qty) Qty
, (
SELECT SUM(b.eac_amount) [Budg Rev]
FROM pjptdsum b
INNER JOIN pjacct a ON a.acct = b.acct
AND a.acct_type = 'RV'
WHERE ARDoc.ProjectID = b.project) Budget_Rev
, (
SELECT SUM(b.eac_amount) [Budg Rev]
FROM pjptdsum b
INNER JOIN pjacct a ON a.acct = b.acct
AND a.acct_type = 'EX'
WHERE ARDoc.ProjectID = b.project) Budget_EAC
, so.TotMerch SalesOrderTotal
, Salesperson.Name
, ARTran.PerPost
, PJPROJ.manager2
, PJEMPLOY.emp_name
FROM Testnewgroundapp.dbo.ARDoc ARDoc
INNER JOIN Testnewgroundapp.dbo.ARTran ARTran ON ARDoc.CustId = ARTran.CustId
AND ARDoc.RefNbr = ARTran.RefNbr
AND ARDoc.DocType = ARTran.TranType
INNER JOIN Testnewgroundapp.dbo.Customer Customer ON ARDoc.CustId = Customer.CustId --INNER JOIN #CustomerTab ct
LEFT OUTER JOIN Testnewgroundapp.dbo.Salesperson Salesperson ON ARDoc.SlsperId = Salesperson.SlsperId
LEFT OUTER JOIN Testnewgroundapp.dbo.PJPROJ PJPROJ ON ARDoc.ProjectID = PJPROJ.project
LEFT OUTER JOIN Testnewgroundapp.dbo.PJEMPLOY PJEMPLOY ON PJPROJ.manager2 = PJEMPLOY.employee
LEFT OUTER JOIN (
SELECT h.PerPost
, h.SlsperID
, SUM(h.TotMerch) TotMerch
FROM SOShipHeader H
GROUP BY h.PerPost
, h.SlsperID) so ON ARTran.PerPost = so.PerPost
AND ARDoc.SlsperId = so.SlsperID
LEFT OUTER JOIN TestCommissions.dbo.SalespersonProject SalespersonProject ON SalespersonProject.ProjectId = PJPROJ.project --AND SalespersonProject.SalesPerson_Id = #ApplicationUserID
LEFT OUTER JOIN TestCommissions.dbo.SalesPerson AppSalesPerson ON AppSalesPerson.Id = SalespersonProject.SalesPerson_Id
WHERE
(ARTran.TranType = 'CM'
AND ARTran.DrCr = 'D'
OR ARTran.DrCr = 'C'
AND
(ARTran.TranType = 'CS'
OR ARTran.TranType = 'DM'
OR ARTran.TranType = 'IN'
)
)
AND ARTran.TaskID NOT LIKE '%60850'
AND ARTRan.TaskID NOT LIKE '%60900'
AND ARTran.invtid <> 'TSCINC001'
AND ARTran.TranClass NOT IN ('F', 'N', 'T')
AND ARTran.Acct NOT IN ('2590', '2040', '2037')
AND CONVERT(INT, ARTran.Acct) > 1301
AND CONVERT(INT, ARTran.PerPost) BETWEEN 201504 AND 201504
AND ARTran.Rlsed = 1
AND PJPROJ.project IS NOT NULL
AND artran.cpnyid IN ('R', 'A')
GROUP BY ARDoc.SlsperId
, ARDoc.ProjectID
, PJPROJ.project
, PJPROJ.project_desc
, PJPROJ.slsperid
, ARDoc.CustId
, ARTran.InvtId
, Customer.BillName
, ARTran.TranDate
, ARTran.TranType
, ARTran.RefNbr
, PJPROJ.start_date
, so.TotMerch
, Salesperson.Name
, ARTran.PerPost
, ARDoc.CpnyID
, PJPROJ.manager2
, PJEMPLOY.emp_name
HAVING ARDoc.SlsperId = 'bpettit'
ORDER BY ARDoc.SlsperId, ARTran.PerPost, PJPROJ.project

Answer 1

If an extra joined table has two records per one main record, this makes each main record appear twice in the result set. The following grouping and summing will then sum each value of the main record or another joined table twice.
Temporarily remove the grouping and summing, but keep all the joins and look at the result set. You will then probably see what causes this doubling.