Index: Ringtoets/StabilityStoneCover/src/Ringtoets.StabilityStoneCover.Plugin/StabilityStoneCoverPlugin.cs
===================================================================
diff -u -rce838df77e52c137f37af92e1b2537c22e902392 -r068c18cea62900179b14a9b2355237c363c903fb
--- Ringtoets/StabilityStoneCover/src/Ringtoets.StabilityStoneCover.Plugin/StabilityStoneCoverPlugin.cs	(.../StabilityStoneCoverPlugin.cs)	(revision ce838df77e52c137f37af92e1b2537c22e902392)
+++ Ringtoets/StabilityStoneCover/src/Ringtoets.StabilityStoneCover.Plugin/StabilityStoneCoverPlugin.cs	(.../StabilityStoneCoverPlugin.cs)	(revision 068c18cea62900179b14a9b2355237c363c903fb)
@@ -326,7 +326,8 @@
                           .AddSeparator()
                           .AddPerformAllCalculationsInFailureMechanismItem(
                               failureMechanismContext,
-                              CalculateAll)
+                              CalculateAll,
+                              ValidateAllDataAvailableAndGetErrorMessageForFailureMechanism)
                           .AddSeparator()
                           .AddCollapseAllItem()
                           .AddExpandAllItem()
@@ -469,6 +470,11 @@
                         context.AssessmentSection);
         }
 
+        private static string ValidateAllDataAvailableAndGetErrorMessageForFailureMechanism(StabilityStoneCoverFailureMechanismContext context)
+        {
+            return ValidateAllDataAvailableAndGetErrorMessage(context.Parent);
+        }
+
         private static string ValidateAllDataAvailableAndGetErrorMessageForCalculationGroup(StabilityStoneCoverWaveConditionsCalculationGroupContext context)
         {
             return ValidateAllDataAvailableAndGetErrorMessage(context.AssessmentSection);