diff --git a/ReportImp/DomizielAnsbach/ServiceInvoiceReport.cs b/ReportImp/DomizielAnsbach/ServiceInvoiceReport.cs
index cf97a3564..556b2dfc8 100644
--- a/ReportImp/DomizielAnsbach/ServiceInvoiceReport.cs
+++ b/ReportImp/DomizielAnsbach/ServiceInvoiceReport.cs
@@ -150,7 +150,7 @@ namespace DomizielAnsbach
 
         private Person GetKontaktPerson(ServiceInvoiceRO pRO)
         {
-            if (pRO.ServiceInvoicePeriods.Count > 0)
+            if (pRO.ServiceInvoicePeriods.Count > 0 && !pRO.ServiceInvoicePeriods[0].ServiceInvoiceItems[0].ServiceDescription.StartsWith("Rechnungsdifferenz"))
             {
                 var c2s = pRO.ServiceInvoicePeriods[0].CostBearer2SupportConcept;
                 return c2s.CostBearerContactPerson;