diff --git a/ReportImp/DiakonischesWerkMuelheimTwg/Export/DatevExporter.cs b/ReportImp/DiakonischesWerkMuelheimTwg/Export/DatevExporter.cs
index f55d05e21..db9a10070 100644
--- a/ReportImp/DiakonischesWerkMuelheimTwg/Export/DatevExporter.cs
+++ b/ReportImp/DiakonischesWerkMuelheimTwg/Export/DatevExporter.cs
@@ -153,7 +153,7 @@ ib.Oid
  inner join invoicebase ib on ib.costbearer2supportconceptoid = c2s.oid
  inner join serviceinvoice si on si.invoicebaseoid = ib.oid
  inner join serviceinvoiceperiod sip on sip.serviceinvoiceoid = si.oid
-WHERE  ib.`AccountingPeriodEnd` >= ':Monat_Start' AND ib.`AccountingPeriodEnd` < ':Monat_End' and ib.IsActive = 1
+WHERE  ib.`AccountingPeriodEnd` >= ':Monat_Start' AND ib.`AccountingPeriodEnd` < ':Monat_End' and ib.IsActive = 1 AND ib.IsExported = 0
 order by ib.invoicenumber
 ";