Index: Application/Ringtoets/src/Application.Ringtoets.Storage/Read/GrassCoverErosionOutwards/GrassCoverErosionOutwardsHydraulicLocationEntityReadExtensions.cs
===================================================================
diff -u -rc0532d07766ecad2566f7cfa4a97a9aeb6e8540c -rea4051c2b13cdb0d1f93af36b5eb2eb527a1f49b
--- Application/Ringtoets/src/Application.Ringtoets.Storage/Read/GrassCoverErosionOutwards/GrassCoverErosionOutwardsHydraulicLocationEntityReadExtensions.cs	(.../GrassCoverErosionOutwardsHydraulicLocationEntityReadExtensions.cs)	(revision c0532d07766ecad2566f7cfa4a97a9aeb6e8540c)
+++ Application/Ringtoets/src/Application.Ringtoets.Storage/Read/GrassCoverErosionOutwards/GrassCoverErosionOutwardsHydraulicLocationEntityReadExtensions.cs	(.../GrassCoverErosionOutwardsHydraulicLocationEntityReadExtensions.cs)	(revision ea4051c2b13cdb0d1f93af36b5eb2eb527a1f49b)
@@ -21,6 +21,7 @@
 
 using System;
 using System.Linq;
+using Application.Ringtoets.Storage.Create.GrassCoverErosionOutwards;
 using Application.Ringtoets.Storage.DbContext;
 using Ringtoets.Common.Data.Hydraulics;
 
@@ -47,10 +48,12 @@
             {
                 throw new ArgumentNullException(nameof(entity));
             }
+
             if (collector == null)
             {
                 throw new ArgumentNullException(nameof(collector));
             }
+
             if (collector.Contains(entity))
             {
                 return collector.Get(entity);
@@ -76,7 +79,7 @@
             waveHeightCalculation.InputParameters.ShouldIllustrationPointsBeCalculated =
                 Convert.ToBoolean(entity.ShouldWaveHeightIllustrationPointsBeCalculated);
 
-            IHydraulicLocationOutputEntity waveHeightOutputEntity =
+            GrassCoverErosionOutwardsHydraulicLocationOutputEntity waveHeightOutputEntity =
                 GetGrassCoverErosionOutwardsHydraulicLocationOutputEntity(entity, HydraulicLocationOutputType.WaveHeight);
             if (waveHeightOutputEntity != null)
             {
@@ -90,15 +93,15 @@
             designWaterLevelCalculation.InputParameters.ShouldIllustrationPointsBeCalculated =
                 Convert.ToBoolean(entity.ShouldDesignWaterLevelIllustrationPointsBeCalculated);
 
-            IHydraulicLocationOutputEntity designWaterLevelOutputEntity =
+            GrassCoverErosionOutwardsHydraulicLocationOutputEntity designWaterLevelOutputEntity =
                 GetGrassCoverErosionOutwardsHydraulicLocationOutputEntity(entity, HydraulicLocationOutputType.DesignWaterLevel);
             if (designWaterLevelOutputEntity != null)
             {
                 designWaterLevelCalculation.Output = designWaterLevelOutputEntity.Read();
             }
         }
 
-        private static IHydraulicLocationOutputEntity GetGrassCoverErosionOutwardsHydraulicLocationOutputEntity(
+        private static GrassCoverErosionOutwardsHydraulicLocationOutputEntity GetGrassCoverErosionOutwardsHydraulicLocationOutputEntity(
             GrassCoverErosionOutwardsHydraulicLocationEntity entity, HydraulicLocationOutputType outputType)
         {
             return entity.GrassCoverErosionOutwardsHydraulicLocationOutputEntities.SingleOrDefault(