Index: Application/Ringtoets/src/Application.Ringtoets.Storage/Create/PersistenceRegistry.cs
===================================================================
diff -u -r47c3d018102688c579d1450a890f2c3691bcbcf2 -r1e9309149f9387c4e8b10f6c5f429797220b0ef8
--- Application/Ringtoets/src/Application.Ringtoets.Storage/Create/PersistenceRegistry.cs	(.../PersistenceRegistry.cs)	(revision 47c3d018102688c579d1450a890f2c3691bcbcf2)
+++ Application/Ringtoets/src/Application.Ringtoets.Storage/Create/PersistenceRegistry.cs	(.../PersistenceRegistry.cs)	(revision 1e9309149f9387c4e8b10f6c5f429797220b0ef8)
@@ -757,6 +757,18 @@
         }
 
         /// <summary>
+        /// Checks whether a create or update operations has been registered for the given
+        /// <paramref name="model"/>.
+        /// </summary>
+        /// <param name="model">The <see cref="GrassCoverErosionInwardsCalculation"/> to check for.</param>
+        /// <returns><c>true</c> if the <see cref="model"/> was registered before, <c>false</c> otherwise.</returns>
+        /// <exception cref="ArgumentNullException">Thrown when <paramref name="model"/> is <c>null</c>.</exception>
+        internal bool Contains(GrassCoverErosionInwardsCalculation model)
+        {
+            return ContainsValue(grassCoverErosionInwardsCalculations, model);
+        }
+
+        /// <summary>
         /// Obtains the <see cref="StochasticSoilModelEntity"/> which was registered for
         /// the given <paramref name="model"/>.
         /// </summary>
@@ -876,6 +888,23 @@
         }
 
         /// <summary>
+        /// Obtains the <see cref="GrassCoverErosionInwardsCalculationEntity"/> which was
+        /// registered for the given <paramref name="model"/>.
+        /// </summary>
+        /// <param name="model">The <see cref="GrassCoverErosionInwardsCalculation"/> for
+        /// which a read/update operation has been registered.</param>
+        /// <returns>The constructed <see cref="GrassCoverErosionInwardsCalculationEntity"/>.</returns>
+        /// <exception cref="ArgumentNullException">Thrown when <paramref name="model"/> is <c>null</c>.</exception>
+        /// <exception cref="InvalidOperationException">Thrown when no create/update operation 
+        /// has been registered for <paramref name="model"/>.</exception>
+        /// <remarks>Use <see cref="Contains(GrassCoverErosionInwardsCalculation)"/> to find out
+        /// whether a create/update operation has been registered for <paramref name="model"/>.</remarks>
+        internal GrassCoverErosionInwardsCalculationEntity Get(GrassCoverErosionInwardsCalculation model)
+        {
+            return Get(grassCoverErosionInwardsCalculations, model);
+        }
+
+        /// <summary>
         /// Registers a create or update operation for <paramref name="model"/> and the
         /// <paramref name="entity"/> that was constructed with the information.
         /// </summary>