Index: Ringtoets/Demo/src/Ringtoets.Demo/Commands/AddNewDemoDikeAssessmentSectionCommand.cs
===================================================================
diff -u -r55ad1d69b06d380c225f26750cf93631f5851ada -r6bcbd610ececdc293a8883b50448f369e1fa4a25
--- Ringtoets/Demo/src/Ringtoets.Demo/Commands/AddNewDemoDikeAssessmentSectionCommand.cs	(.../AddNewDemoDikeAssessmentSectionCommand.cs)	(revision 55ad1d69b06d380c225f26750cf93631f5851ada)
+++ Ringtoets/Demo/src/Ringtoets.Demo/Commands/AddNewDemoDikeAssessmentSectionCommand.cs	(.../AddNewDemoDikeAssessmentSectionCommand.cs)	(revision 6bcbd610ececdc293a8883b50448f369e1fa4a25)
@@ -61,7 +61,7 @@
                 surfaceLinesImporter.Import(pipingFailureMechanism.SoilProfiles, tempPath.FilePath);
             }
 
-            var calculation = pipingFailureMechanism.Calculations.GetPipingCalculations().First();
+            var calculation = pipingFailureMechanism.CalculationsGroup.GetPipingCalculations().First();
             calculation.InputParameters.SurfaceLine = pipingFailureMechanism.SurfaceLines.First(sl => sl.Name == "PK001_0001");
             calculation.InputParameters.SoilProfile = pipingFailureMechanism.SoilProfiles.First(sl => sl.Name == "AD640M00_Segment_36005_1D2");
         }