Index: Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Plugin/MacroStabilityInwardsPlugin.cs
===================================================================
diff -u -r3eb84a3e28918618dc1922b9e8228d0826756b1d -r6bc9f77c55e1fba2e86203b22778f8a405aee2eb
--- Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Plugin/MacroStabilityInwardsPlugin.cs	(.../MacroStabilityInwardsPlugin.cs)	(revision 3eb84a3e28918618dc1922b9e8228d0826756b1d)
+++ Ringtoets/MacroStabilityInwards/src/Ringtoets.MacroStabilityInwards.Plugin/MacroStabilityInwardsPlugin.cs	(.../MacroStabilityInwardsPlugin.cs)	(revision 6bc9f77c55e1fba2e86203b22778f8a405aee2eb)
@@ -588,16 +588,6 @@
                     .ToList());
         }
 
-        private static string ValidateAllDataAvailableAndGetErrorMessage(IFailureMechanism failureMechanism)
-        {
-            if (failureMechanism.Contribution <= 0.0)
-            {
-                return RingtoetsCommonFormsResources.Contribution_of_failure_mechanism_zero;
-            }
-
-            return null;
-        }
-
         #region MacroStabilityInwardsSurfaceLinesContext TreeNodeInfo
 
         private ContextMenuStrip MacroStabilityInwardsSurfaceLinesContextContextMenuStrip(MacroStabilityInwardsSurfaceLinesContext nodeData, object parentData, TreeViewControl treeViewControl)
@@ -646,12 +636,10 @@
                           .AddSeparator()
                           .AddValidateAllCalculationsInFailureMechanismItem(
                               macroStabilityInwardsFailureMechanismContext,
-                              ValidateAll,
-                              ValidateAllDataAvailableAndGetErrorMessage)
+                              ValidateAll)
                           .AddPerformAllCalculationsInFailureMechanismItem(
                               macroStabilityInwardsFailureMechanismContext,
-                              CalculateAll,
-                              ValidateAllDataAvailableAndGetErrorMessage)
+                              CalculateAll)
                           .AddSeparator()
                           .AddClearAllCalculationOutputInFailureMechanismItem(macroStabilityInwardsFailureMechanismContext.WrappedData)
                           .AddSeparator()
@@ -685,11 +673,6 @@
                           .Build();
         }
 
-        private static string ValidateAllDataAvailableAndGetErrorMessage(MacroStabilityInwardsFailureMechanismContext context)
-        {
-            return ValidateAllDataAvailableAndGetErrorMessage(context.WrappedData);
-        }
-
         private static IEnumerable<MacroStabilityInwardsCalculation> GetAllMacroStabilityInwardsCalculations(MacroStabilityInwardsFailureMechanism failureMechanism)
         {
             return failureMechanism.Calculations.OfType<MacroStabilityInwardsCalculation>();
@@ -759,13 +742,11 @@
                           .AddSeparator()
                           .AddValidateCalculationItem(
                               nodeData,
-                              Validate,
-                              ValidateAllDataAvailableAndGetErrorMessage)
+                              Validate)
                           .AddPerformCalculationItem(
                               calculation,
                               nodeData,
-                              PerformCalculation,
-                              ValidateAllDataAvailableAndGetErrorMessage)
+                              PerformCalculation)
                           .AddSeparator()
                           .AddClearCalculationOutputItem(calculation)
                           .AddDeleteItem()
@@ -814,11 +795,6 @@
             MacroStabilityInwardsCalculationService.Validate(context.WrappedData, GetNormativeAssessmentLevel(context.AssessmentSection, context.WrappedData));
         }
 
-        private static string ValidateAllDataAvailableAndGetErrorMessage(MacroStabilityInwardsCalculationScenarioContext context)
-        {
-            return ValidateAllDataAvailableAndGetErrorMessage(context.FailureMechanism);
-        }
-
         private void PerformCalculation(MacroStabilityInwardsCalculation calculation, MacroStabilityInwardsCalculationScenarioContext context)
         {
             ActivityProgressDialogRunner.Run(Gui.MainWindow,
@@ -908,13 +884,11 @@
 
             builder.AddValidateAllCalculationsInGroupItem(
                        nodeData,
-                       ValidateAll,
-                       ValidateAllDataAvailableAndGetErrorMessage)
+                       ValidateAll)
                    .AddPerformAllCalculationsInGroupItem(
                        group,
                        nodeData,
-                       CalculateAll,
-                       ValidateAllDataAvailableAndGetErrorMessage)
+                       CalculateAll)
                    .AddSeparator()
                    .AddClearAllCalculationOutputInGroupItem(group);
 
@@ -968,11 +942,6 @@
             };
         }
 
-        private static string ValidateAllDataAvailableAndGetErrorMessage(MacroStabilityInwardsCalculationGroupContext context)
-        {
-            return ValidateAllDataAvailableAndGetErrorMessage(context.FailureMechanism);
-        }
-
         private void ShowSurfaceLineSelectionDialog(MacroStabilityInwardsCalculationGroupContext nodeData)
         {
             using (var view = new MacroStabilityInwardsSurfaceLineSelectionDialog(Gui.MainWindow, nodeData.AvailableMacroStabilityInwardsSurfaceLines))