Index: Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Service/GrassCoverErosionOutwardsWaveConditionsCalculationActivity.cs
===================================================================
diff -u -r0bb11ec189709c999bee440a31c003f00b0a3a2b -r2c68fa9dd748870624f45c0f2ae6a30327485a63
--- Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Service/GrassCoverErosionOutwardsWaveConditionsCalculationActivity.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationActivity.cs)	(revision 0bb11ec189709c999bee440a31c003f00b0a3a2b)
+++ Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Service/GrassCoverErosionOutwardsWaveConditionsCalculationActivity.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationActivity.cs)	(revision 2c68fa9dd748870624f45c0f2ae6a30327485a63)
@@ -87,7 +87,7 @@
 
         protected override void OnRun()
         {
-            PerformRun(() => true,
+            PerformRun(() => WaveConditionsCalculationService.Instance.Validate(calculation.InputParameters, assessmentSection.HydraulicBoundaryDatabase, calculation.Name),
                        () => GrassCoverErosionOutwardsDataSynchronizationService.ClearWaveConditionsCalculationOutput(calculation),
                        () =>
                        {
Index: Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Forms.Test/TreeNodeInfos/GrassCoverErosionOutwardsWaveConditionsCalculationGroupContextTreeNodeInfoTest.cs
===================================================================
diff -u -r7da3e50da60f27ba27ec7c97c860d8c0b92eb313 -r2c68fa9dd748870624f45c0f2ae6a30327485a63
--- Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Forms.Test/TreeNodeInfos/GrassCoverErosionOutwardsWaveConditionsCalculationGroupContextTreeNodeInfoTest.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationGroupContextTreeNodeInfoTest.cs)	(revision 7da3e50da60f27ba27ec7c97c860d8c0b92eb313)
+++ Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Forms.Test/TreeNodeInfos/GrassCoverErosionOutwardsWaveConditionsCalculationGroupContextTreeNodeInfoTest.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationGroupContextTreeNodeInfoTest.cs)	(revision 2c68fa9dd748870624f45c0f2ae6a30327485a63)
@@ -663,8 +663,9 @@
             assessmentSection.Stub(a => a.FailureMechanismContribution).Return(
                 new FailureMechanismContribution(Enumerable.Empty<IFailureMechanism>(), 30, 2));
 
-            var calculation = new GrassCoverErosionOutwardsWaveConditionsCalculation
+            var calculationA = new GrassCoverErosionOutwardsWaveConditionsCalculation
             {
+                Name = "A",
                 InputParameters =
                 {
                     HydraulicBoundaryLocation = new HydraulicBoundaryLocation(1, "", 1, 1)
@@ -678,10 +679,27 @@
                     UpperBoundaryWaterLevels = (RoundedDouble) 10.0
                 }
             };
+            var calculationB = new GrassCoverErosionOutwardsWaveConditionsCalculation
+            {
+                Name = "B",
+                InputParameters =
+                {
+                    HydraulicBoundaryLocation = new HydraulicBoundaryLocation(1, "", 1, 1)
+                    {
+                        DesignWaterLevel = (RoundedDouble)12.0
+                    },
+                    LowerBoundaryRevetment = (RoundedDouble)1.0,
+                    UpperBoundaryRevetment = (RoundedDouble)10.0,
+                    StepSize = WaveConditionsInputStepSize.One,
+                    LowerBoundaryWaterLevels = (RoundedDouble)1.0,
+                    UpperBoundaryWaterLevels = (RoundedDouble)10.0
+                }
+            };
 
+
             var group = new CalculationGroup();
-            group.Children.Add(calculation);
-            group.Children.Add(calculation);
+            group.Children.Add(calculationA);
+            group.Children.Add(calculationB);
 
             var failureMechanism = new GrassCoverErosionOutwardsFailureMechanism();
             failureMechanism.WaveConditionsCalculationGroup.Children.Add(group);
@@ -714,15 +732,15 @@
                     {
                         var messages = m.ToArray();
                         Assert.AreEqual(4, messages.Length);
-                        StringAssert.StartsWith("Validatie van 'Nieuwe berekening' gestart om: ", messages[0]);
-                        StringAssert.StartsWith("Validatie van 'Nieuwe berekening' beëindigd om: ", messages[1]);
-                        StringAssert.StartsWith("Validatie van 'Nieuwe berekening' gestart om: ", messages[2]);
-                        StringAssert.StartsWith("Validatie van 'Nieuwe berekening' beëindigd om: ", messages[3]);
+                        StringAssert.StartsWith("Validatie van 'A' gestart om: ", messages[0]);
+                        StringAssert.StartsWith("Validatie van 'A' beëindigd om: ", messages[1]);
+                        StringAssert.StartsWith("Validatie van 'B' gestart om: ", messages[2]);
+                        StringAssert.StartsWith("Validatie van 'B' beëindigd om: ", messages[3]);
                     });
                 }
             }
         }
-
+        
         [Test]
         public void ContextMenuStrip_TwoCalculationsClickOnCalculateAllInGroup_MessagesLogged()
         {
Index: Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Integration.Test/GrassCoverErosionOutwardsWaveConditionsCalculationActivityIntegrationTest.cs
===================================================================
diff -u -r14a346e335356ca0a7403cfc940610f739a6362e -r2c68fa9dd748870624f45c0f2ae6a30327485a63
--- Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Integration.Test/GrassCoverErosionOutwardsWaveConditionsCalculationActivityIntegrationTest.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationActivityIntegrationTest.cs)	(revision 14a346e335356ca0a7403cfc940610f739a6362e)
+++ Ringtoets/GrassCoverErosionOutwards/test/Ringtoets.GrassCoverErosionOutwards.Integration.Test/GrassCoverErosionOutwardsWaveConditionsCalculationActivityIntegrationTest.cs	(.../GrassCoverErosionOutwardsWaveConditionsCalculationActivityIntegrationTest.cs)	(revision 2c68fa9dd748870624f45c0f2ae6a30327485a63)
@@ -156,10 +156,12 @@
                 TestHelper.AssertLogMessages(call, messages =>
                 {
                     var msgs = messages.ToArray();
-                    Assert.AreEqual(11, msgs.Length);
-                    StringAssert.StartsWith(string.Format("Berekening van '{0}' gestart om: ", calculation.Name), msgs[0]);
+                    Assert.AreEqual(13, msgs.Length);
+                    StringAssert.StartsWith(string.Format("Validatie van '{0}' gestart om: ", calculation.Name), msgs[0]);
+                    StringAssert.StartsWith(string.Format("Validatie van '{0}' beëindigd om: ", calculation.Name), msgs[1]);
+                    StringAssert.StartsWith(string.Format("Berekening van '{0}' gestart om: ", calculation.Name), msgs[2]);
 
-                    int i = 0;
+                    int i = 2;
                     foreach (var waterLevel in calculation.InputParameters.WaterLevels)
                     {
                         StringAssert.StartsWith(string.Format("Berekening '{0}' voor waterstand '{1}' gestart om: ", calculation.Name, waterLevel), msgs[i + 1]);
@@ -169,7 +171,7 @@
                         i = i + 3;
                     }
 
-                    StringAssert.StartsWith(string.Format("Berekening van '{0}' beëindigd om: ", calculation.Name), msgs[10]);
+                    StringAssert.StartsWith(string.Format("Berekening van '{0}' beëindigd om: ", calculation.Name), msgs[12]);
                 });
                 Assert.AreEqual(ActivityState.Failed, activity.State);
             }