diff --git a/ReportImp/BeWoTrio/BeWoTrio.csproj b/ReportImp/BeWoTrio/BeWoTrio.csproj
index a1441b7a5..6bc42f83f 100644
--- a/ReportImp/BeWoTrio/BeWoTrio.csproj
+++ b/ReportImp/BeWoTrio/BeWoTrio.csproj
@@ -74,6 +74,7 @@
     <Compile Include="ServiceInvoiceReport.Designer.cs">
       <DependentUpon>ServiceInvoiceReport.cs</DependentUpon>
     </Compile>
+    <Compile Include="Service\CustomAccountingService.cs" />
     <Compile Include="SettlementReport.cs">
       <SubType>Component</SubType>
     </Compile>
@@ -119,6 +120,10 @@
       <Project>{40D8B312-EA64-49E3-A31A-5E57ED4D5654}</Project>
       <Name>Report</Name>
     </ProjectReference>
+    <ProjectReference Include="..\..\Service\Service.csproj">
+      <Project>{094331C3-ECEE-4C89-BBFD-4C9DED89F0EF}</Project>
+      <Name>Service</Name>
+    </ProjectReference>
     <ProjectReference Include="..\..\Shared\Shared.csproj">
       <Project>{2F50B83D-A3F0-4EC4-979A-3F9B7E3D8ED4}</Project>
       <Name>Shared</Name>
diff --git a/ReportImp/BeWoTrio/Service/CustomAccountingService.cs b/ReportImp/BeWoTrio/Service/CustomAccountingService.cs
new file mode 100644
index 000000000..1a865ba8f
--- /dev/null
+++ b/ReportImp/BeWoTrio/Service/CustomAccountingService.cs
@@ -0,0 +1,45 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Windows;
+using BeWo.Data.Access;
+using BeWo.Data.Entities;
+using BeWo.Service.DCEntityMapper;
+using BeWo.Service.Plugins;
+using BS.Shared;
+using BS.Shared.DataContracts;
+
+
+namespace BeWoTrio.Service
+{
+	public class CustomAccountingService : AccountingService
+    {
+        public override ServiceInvoice ErstelleStornoRechnung(InvoiceBaseDC ibdc)
+        {
+            var i = base.ErstelleStornoRechnung(ibdc);
+            //if (!String.IsNullOrEmpty(i.InvoiceBase.InvoiceNumber))
+            //{
+            //    //i.InvoiceBase.InvoiceNumber = ibdc.InvoiceNumber + " Storno";
+            //    i.InvoiceBase.InvoiceNumber = i.InvoiceBase.InvoiceNumber + " Storno";
+            //}
+            int invoiceCounter = 0;
+            var inc = PluginLoader.FindClass<InvoiceNumberGenerator>();
+            i.InvoiceBase.InvoiceNumber = i.InvoiceBase.InvoiceNumber + " Storno";
+
+            if (String.IsNullOrEmpty(i.InvoiceBase.InvoiceTypeText))
+            {
+                i.InvoiceBase.InvoiceTypeText = "Storno";
+            }
+            else
+            {
+                i.InvoiceBase.InvoiceTypeText += " Storno";
+            }
+            
+            DAOFactory.GenericDAO.Insert(i);
+
+            //inc.IncreaseInvoiceNumber(1, null);
+
+            return i;
+        }
+    }
+}
\ No newline at end of file