GROUP BY Not Working

This query gives me Customer Sales data. SQL Server 2005. This is grouped by Region and Location. A customer such as 'ABC' should only show up once per Location, but it is pulling in some companies more than once. Can anyone help me figure out how to group this so this gets fixed?



SELECTRegion,
Location,
WarehouseCode,
CASE
WHEN CustRank <= 19 THEN CustomerNumber
ELSE 'AllOthers'
END AS CustomerNumber,
CustomerName,
MonthLessEleven,
MonthLessTen,
MonthLessNine,
MonthLessEight,
MonthLessSeven,
MonthLessSix,
MonthLessFive,
MonthLessFour,
MonthLessThree,
MonthLessTwo,
MonthLessOne,
CurrentMonth,
CurrentYearTotal,
LastYearYTD,
LastYearTotal,
CASE
WHEN CustRank <= 19 THEN CustRank
ELSE 20
END AS CustRank
FROM(
SELECTgla.Region,
gla.Location,
ihh.WarehouseCode,
ihh.CustomerNumber,
cm.CustomerName,
SUM(CASE WHEN DATEDIFF(MONTH, ihh.SOTransDate, GETDATE()) = 11 THEN ihd.SOExtChargeAmount ELSE 0 END) AS MonthLessEleven,
SUM(CASE WHEN DATEDIFF(MONTH, ihh.SOTransDate, GETDATE()) = 10 THEN ihd.SOExtChargeAmount ELSE 0 END) AS MonthLessTen,
SUM(CASE WHEN DATEDIFF(MONTH, ihh.SOTransDate, GETDATE()) = 9 THEN ihd.SOExtChargeAmount ELSE 0 END) AS MonthLessNine,
SUM(CASE WHEN DATEDIFF(MONTH, ihh.SOTransDate, GETDATE()) = 8 THEN ihd.SOExtChargeAmount ELSE 0 END) AS MonthLessEight,
SUM(CASE WHEN DATEDIFF(MONTH, ihh.SOTransDate, GETDATE()) = 7 THEN ihd.SOExtChargeAmount ELSE 0 END) AS MonthLessSeven,
SUM(CASE WHEN DATEDIFF(MONTH, ihh.SOTransDate, GETDATE()) = 6 THEN ihd.SOExtChargeAmount ELSE 0 END) AS MonthLessSix,
SUM(CASE WHEN DATEDIFF(MONTH, ihh.SOTransDate, GETDATE()) = 5 THEN ihd.SOExtChargeAmount ELSE 0 END) AS MonthLessFive,
SUM(CASE WHEN DATEDIFF(MONTH, ihh.SOTransDate, GETDATE()) = 4 THEN ihd.SOExtChargeAmount ELSE 0 END) AS MonthLessFour,
SUM(CASE WHEN DATEDIFF(MONTH, ihh.SOTransDate, GETDATE()) = 3 THEN ihd.SOExtChargeAmount ELSE 0 END) AS MonthLessThree,
SUM(CASE WHEN DATEDIFF(MONTH, ihh.SOTransDate, GETDATE()) = 2 THEN ihd.SOExtChargeAmount ELSE 0 END) AS MonthLessTwo,
SUM(CASE WHEN DATEDIFF(MONTH, ihh.SOTransDate, GETDATE()) = 1 THEN ihd.SOExtChargeAmount ELSE 0 END) AS MonthLessOne,
SUM(CASE WHEN DATEDIFF(MONTH, ihh.SOTransDate, GETDATE()) = 0 THEN ihd.SOExtChargeAmount ELSE 0 END) AS CurrentMonth,
SUM(CASE WHEN DATEDIFF(YEAR, ihh.SOTransDate, GETDATE()) = 0 THEN ihd.SOExtChargeAmount ELSE 0 END) AS CurrentYearTotal,
SUM(CASE WHEN DATEADD(YEAR, - 1, GETDATE()) > ihh.SOTransDate AND DATEDIFF(YEAR, ihh.SOTransDate, GETDATE()) = 1 THEN ihd.SOExtChargeAmount ELSE 0 END) AS LastYearYTD,
SUM(CASE WHEN DATEDIFF(YEAR, ihh.SOTransDate, GETDATE()) = 1 THEN ihd.SOExtChargeAmount ELSE 0 END) LastYearTotal,
ROW_NUMBER() OVER (PARTITION BY gla.Region ORDER BY gla.Region, SUM(CASE WHEN DATEDIFF(YEAR, ihh.SOTransDate, GETDATE()) = 0 THEN ihd.SOExtChargeAmount ELSE 0 END) DESC) AS CustRank
FROMMAS_BIF_AR1_CustomerMaster AS cm
INNER JOINMAS_BIF_ARN_InvHistoryHeader AS ihh ON ihh.CustomerNumber = cm.CustomerNumber
INNER JOINMAS_BIF_ARO_InvHistoryDetail AS ihd ON ihd.InvoiceNumber = ihh.InvoiceNumber
INNER JOIN


(
SELECTAccountKey,
Account,
CASE SUBSTRING(Account, 5, 3)
WHEN '936' THEN 'North Region'
WHEN '908' THEN 'East Region'
ELSE 'Unknown'
END AS Region,
CASE SUBSTRING(Account, 5, 3)
WHEN '900' THEN 'ALE'
WHEN '902' THEN 'ATO'
WHEN '904' THEN 'BOW'
WHEN '906' THEN 'BRY'
WHEN '908' THEN 'BPT'
WHEN '910' THEN 'BYD'
WHEN '912' THEN 'BUF'
WHEN '914' THEN 'CLE'
WHEN '916' THEN 'GRN'
WHEN '920' THEN 'DXN'
WHEN '924' THEN 'CTH'
WHEN '926' THEN 'ELC'
WHEN '928' THEN 'FTL'
WHEN '930' THEN 'FTW'
WHEN '932' THEN 'I35'
WHEN '936' THEN 'GAI'
WHEN '000' THEN 'GAI'
WHEN '939' THEN 'STW'
WHEN '940' THEN 'GRE'
WHEN '942' THEN 'HEN'
WHEN '944' THEN 'FTS'
WHEN '948' THEN 'JAC'
WHEN '952' THEN 'JEN'
WHEN '956' THEN 'KIL'
WHEN '957' THEN 'MCA'
WHEN '958' THEN 'MIN'
WHEN '960' THEN 'NOC'
WHEN '962' THEN 'ODE'
WHEN '964' THEN 'BTP'
WHEN '966' THEN 'RA'
WHEN '968' THEN 'RIF'
WHEN '970' THEN 'SWD'
WHEN '971' THEN '3PS'
WHEN '972' THEN 'ROC'
WHEN '976' THEN 'SJO'
WHEN '978' THEN 'SMB'
WHEN '980' THEN 'STO'
WHEN '982' THEN 'TOL'
WHEN '984' THEN 'VEL'
WHEN '985' THEN 'CFP'
WHEN '986' THEN 'CLM'
WHEN '988' THEN 'WHI'
WHEN '992' THEN 'WRA'
WHEN '995' THEN 'ADM'
ELSE 'Unknown'
END AS Location
FROMMAS_BIF_GL_Account
) AS gla ON gla.AccountKey = ihd.SOGLSalesAcct
GROUP BYSUBSTRING(Account, 5, 3),gla.Region, gla.Location, ihh.CustomerNumber,
cm.CustomerName,
gla.Account,
ihh.WarehouseCode
) AS x