Index: Ringtoets/Piping/src/Ringtoets.Piping.Data/Ringtoets.Piping.Data.csproj
===================================================================
diff -u -rb2a56be4d42df059d8aaaef53cbdce67b48fd9c3 -r1279dcba187f56c0ba96dfdb962067304e333475
--- Ringtoets/Piping/src/Ringtoets.Piping.Data/Ringtoets.Piping.Data.csproj	(.../Ringtoets.Piping.Data.csproj)	(revision b2a56be4d42df059d8aaaef53cbdce67b48fd9c3)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Data/Ringtoets.Piping.Data.csproj	(.../Ringtoets.Piping.Data.csproj)	(revision 1279dcba187f56c0ba96dfdb962067304e333475)
@@ -59,6 +59,7 @@
     <Compile Include="IPipingCalculationItemExtensions.cs" />
     <Compile Include="PipingCalculation.cs" />
     <Compile Include="PipingCalculationGroup.cs" />
+    <Compile Include="PipingCalculationGroupExtensions.cs" />
     <Compile Include="PipingCalculationScenario.cs" />
     <Compile Include="PipingFailureMechanism.cs" />
     <Compile Include="PipingInput.cs" />