diff --git a/ReportImp/SKMAachen/SKMAachen.csproj b/ReportImp/SKMAachen/SKMAachen.csproj
index 3aa1b7027..3ea7769f5 100644
--- a/ReportImp/SKMAachen/SKMAachen.csproj
+++ b/ReportImp/SKMAachen/SKMAachen.csproj
@@ -4,7 +4,7 @@
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
     <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
-    <ProjectGuid>{95342759-C161-4A44-8130-9740E57FE3A1}</ProjectGuid>
+    <ProjectGuid>{C1FED668-ADB9-47E0-B589-1389618E1B6E}</ProjectGuid>
     <OutputType>Library</OutputType>
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>SKMAachen</RootNamespace>
@@ -75,6 +75,7 @@
     <Compile Include="Teamstundenkonto.designer.cs">
       <DependentUpon>Teamstundenkonto.cs</DependentUpon>
     </Compile>
+    <Compile Include="Validation\ServiceRecordValidator.cs" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\Data\Data.csproj">
diff --git a/ReportImp/SKMAachen/Validation/ServiceRecordValidator.cs b/ReportImp/SKMAachen/Validation/ServiceRecordValidator.cs
new file mode 100644
index 000000000..a06f7a21e
--- /dev/null
+++ b/ReportImp/SKMAachen/Validation/ServiceRecordValidator.cs
@@ -0,0 +1,25 @@
+using System;
+using System.Collections.Generic;
+using BeWo.Data.Access;
+using BeWo.Data.Entities;
+using BeWo.Service.Plugins;
+using BS.Shared;
+using BS.Shared.DataContracts;
+
+namespace SKMAachen.Validation
+{
+	public class CustomServiceRecordValidator : ServiceRecordValidator
+	{
+        public override string[] GetIgnoreCategoriesForOverlappingCheck()
+        {
+            return new[] { "Arbeitszeit" };
+        }
+
+        public override String[] GetIgnoreServiceDescriptionsForOverlappingCheck()
+        {
+            return new[] { "Arbeitszeit" };
+        }
+    }
+
+    
+}
\ No newline at end of file