Index: Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Service/GrassCoverErosionOutwardsDataSynchronizationService.cs
===================================================================
diff -u -r8a90c409545ce1b48e018d3b5d6b5982dbef926f -r65cec137f19d9ded25248ba376b2ea8d43c18c2c
--- Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Service/GrassCoverErosionOutwardsDataSynchronizationService.cs	(.../GrassCoverErosionOutwardsDataSynchronizationService.cs)	(revision 8a90c409545ce1b48e018d3b5d6b5982dbef926f)
+++ Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Service/GrassCoverErosionOutwardsDataSynchronizationService.cs	(.../GrassCoverErosionOutwardsDataSynchronizationService.cs)	(revision 65cec137f19d9ded25248ba376b2ea8d43c18c2c)
@@ -20,6 +20,8 @@
 // All rights reserved.
 
 using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Linq;
 using Core.Common.Base;
 using Core.Common.Base.Data;
@@ -78,5 +80,53 @@
 
             return locationsAffected;
         }
+
+        /// <summary>
+        /// Clears the <see cref="HydraulicBoundaryLocation"/> and output for all the wave conditions calculations
+        /// in the <see cref="GrassCoverErosionOutwardsFailureMechanism"/>.
+        /// </summary>
+        /// <param name="failureMechanism">The <see cref="GrassCoverErosionOutwardsFailureMechanism"/>
+        /// which contains the calculations.</param>
+        /// <returns>An <see cref="IEnumerable{T}"/> of calculations which are affected by
+        /// removal of data.</returns>
+        /// <exception cref="ArgumentNullException">Thrown when <paramref name="failureMechanism"/>
+        /// is <c>null</c>.</exception>
+        public static IEnumerable<GrassCoverErosionOutwardsWaveConditionsCalculation> ClearAllCalculationOutputAndHydraulicBoundaryLocations(GrassCoverErosionOutwardsFailureMechanism failureMechanism)
+        {
+            if (failureMechanism == null)
+            {
+                throw new ArgumentNullException("failureMechanism");
+            }
+
+            Collection<GrassCoverErosionOutwardsWaveConditionsCalculation> affectedItems = new Collection<GrassCoverErosionOutwardsWaveConditionsCalculation>();
+            foreach (var calculation in failureMechanism.Calculations.Cast<GrassCoverErosionOutwardsWaveConditionsCalculation>())
+            {
+                var calculationChanged = false;
+
+                if (calculation.HasOutput)
+                {
+                    ClearWaveConditionsCalculationOutput(calculation);
+                    calculationChanged = true;
+                }
+
+                if (calculation.InputParameters.HydraulicBoundaryLocation != null)
+                {
+                    ClearHydraulicBoundaryLocation(calculation);
+                    calculationChanged = true;
+                }
+
+                if (calculationChanged)
+                {
+                    affectedItems.Add(calculation);
+                }
+            }
+
+            return affectedItems;
+        }
+
+        private static void ClearHydraulicBoundaryLocation(GrassCoverErosionOutwardsWaveConditionsCalculation calculation)
+        {
+            calculation.InputParameters.HydraulicBoundaryLocation = null;
+        }
     }
 }
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