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Why am I getting duplicates on this outer join?

SPLady asked
Last Modified: 2012-05-10
Hi experts!  why am i get duplicates with this outer join and what can i do to eliminate them?
SELECT     AVG(vPlanJoin_InvoiceOrder.Order_Plan) AS Order_Plan, AVG(vPlanJoin_InvoiceOrder.Invoice_Plan) AS Invoice_Plan, 
                      SUM(vReportdataCurrentPrior.OrderAmount_LastYear) AS OrderAmount_LastYear, SUM(vReportdataCurrentPrior.InvoiceAmount_LastYear) 
                      AS InvoiceAmount_LastYear, SUM(vReportdataCurrentPrior.OrderAmount_CurrentYear) AS OrderAmount_CurrentYear, 
                      SUM(vReportdataCurrentPrior.InvoiceAmount_CurrentYear) AS InvoiceAmount_CurrentYear, vReportdataCurrentPrior.subProduct, 
                      vPlanJoin_InvoiceOrder.Plan_Month, vReportdataCurrentPrior.site
FROM         vPlanJoin_InvoiceOrder RIGHT OUTER JOIN
                      vReportdataCurrentPrior ON vPlanJoin_InvoiceOrder.recType = vReportdataCurrentPrior.recType AND 
                      vPlanJoin_InvoiceOrder.Plan_Year = vReportdataCurrentPrior.transyear AND 
                      vPlanJoin_InvoiceOrder.Plan_Month = MONTH(vReportdataCurrentPrior.transDate) AND 
                      vPlanJoin_InvoiceOrder.SubProduct = vReportdataCurrentPrior.subProduct
GROUP BY vReportdataCurrentPrior.subProduct, vPlanJoin_InvoiceOrder.Plan_Month, vPlanJoin_InvoiceOrder.EnergyOrg, vReportdataCurrentPrior.site
HAVING      (vPlanJoin_InvoiceOrder.Plan_Month = 11)
ORDER BY vReportdataCurrentPrior.site

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