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Please see above null values for the SQL Query in the report which is making for duplicate reports.
Note:Invoicestring as Key
select inv.InvoiceString,inv.BusinessUnit,inv.InvoiceLanguage,--term.Message
case when term.[Order]=1 then term.Message end as Message1
from
t_rpt_invoice inv
left join t_rpt_InvoiceTerms term on inv.BusinessUnit=term.BusinessUnit and inv.InvoiceLanguage=term.InvoiceLanguage
