Index: Ringtoets/Common/src/Ringtoets.Common.Forms/GuiServices/IHydraulicBoundaryLocationCalculationGuiService.cs
===================================================================
diff -u -rc9c147ae83e52caf44cdd31de783311396348e0a -r75897942629adb76bc369ddc3a2bbb30b2bb4f06
--- Ringtoets/Common/src/Ringtoets.Common.Forms/GuiServices/IHydraulicBoundaryLocationCalculationGuiService.cs	(.../IHydraulicBoundaryLocationCalculationGuiService.cs)	(revision c9c147ae83e52caf44cdd31de783311396348e0a)
+++ Ringtoets/Common/src/Ringtoets.Common.Forms/GuiServices/IHydraulicBoundaryLocationCalculationGuiService.cs	(.../IHydraulicBoundaryLocationCalculationGuiService.cs)	(revision 75897942629adb76bc369ddc3a2bbb30b2bb4f06)
@@ -36,8 +36,7 @@
         /// </summary>
         /// <param name="hydraulicBoundaryDatabaseFilePath">The hydraulic boundary database file that should be used for performing the calculation.</param>
         /// <param name="preprocessorDirectory">The preprocessor directory.</param>
-        /// <param name="locations">The <see cref="HydraulicBoundaryLocation"/> objects to calculate 
-        /// the design water level for.</param>
+        /// <param name="locations">The <see cref="HydraulicBoundaryLocation"/> objects to calculate the design water level for.</param>
         /// <param name="getCalculationFunc"><see cref="Func{T,TResult}"/> for obtaining a <see cref="HydraulicBoundaryLocationCalculation"/>
         /// based on <see cref="HydraulicBoundaryLocation"/>.</param>
         /// <param name="norm">The norm to use during the calculation.</param>
@@ -58,8 +57,7 @@
         /// </summary>
         /// <param name="hydraulicBoundaryDatabaseFilePath">The hydraulic boundary database file that should be used for performing the calculation.</param>
         /// <param name="preprocessorDirectory">The preprocessor directory.</param>
-        /// <param name="locations">The <see cref="HydraulicBoundaryLocation"/> objects to calculate 
-        /// the wave height for.</param>
+        /// <param name="locations">The <see cref="HydraulicBoundaryLocation"/> objects to calculate the wave height for.</param>
         /// <param name="getCalculationFunc"><see cref="Func{T,TResult}"/> for obtaining a <see cref="HydraulicBoundaryLocationCalculation"/>
         /// based on <see cref="HydraulicBoundaryLocation"/>.</param>
         /// <param name="norm">The norm to use during the calculation.</param>
Index: Ringtoets/DuneErosion/src/Ringtoets.DuneErosion.Data/DuneLocation.cs
===================================================================
diff -u -r94ddba04ed109550469cada1ea69083d332cadf7 -r75897942629adb76bc369ddc3a2bbb30b2bb4f06
--- Ringtoets/DuneErosion/src/Ringtoets.DuneErosion.Data/DuneLocation.cs	(.../DuneLocation.cs)	(revision 94ddba04ed109550469cada1ea69083d332cadf7)
+++ Ringtoets/DuneErosion/src/Ringtoets.DuneErosion.Data/DuneLocation.cs	(.../DuneLocation.cs)	(revision 75897942629adb76bc369ddc3a2bbb30b2bb4f06)
@@ -62,6 +62,9 @@
             D50 = new RoundedDouble(6, properties.D50);
 
             Calculation = new DuneLocationCalculation();
+            Calculation2 = new DuneLocationCalculation();
+            Calculation3 = new DuneLocationCalculation();
+            Calculation4 = new DuneLocationCalculation();
         }
 
         /// <summary>
@@ -100,11 +103,26 @@
         public RoundedDouble D50 { get; }
 
         /// <summary>
-        /// Gets the dune erosion calculation.
+        /// Gets the first dune erosion calculation.
         /// </summary>
         public DuneLocationCalculation Calculation { get; }
 
         /// <summary>
+        /// Gets the second dune erosion calculation.
+        /// </summary>
+        public DuneLocationCalculation Calculation2 { get; }
+
+        /// <summary>
+        /// Gets the third dune erosion calculation.
+        /// </summary>
+        public DuneLocationCalculation Calculation3 { get; }
+
+        /// <summary>
+        /// Gets the fourth dune erosion calculation.
+        /// </summary>
+        public DuneLocationCalculation Calculation4 { get; }
+
+        /// <summary>
         /// Class holding the various construction parameters for <see cref="DuneLocation"/>.
         /// </summary>
         public class ConstructionProperties
Index: Ringtoets/DuneErosion/test/Ringtoets.DuneErosion.Data.Test/DuneLocationTest.cs
===================================================================
diff -u -rc4ae90a1a5207672a7b4437d4f9aea1d301fb37a -r75897942629adb76bc369ddc3a2bbb30b2bb4f06
--- Ringtoets/DuneErosion/test/Ringtoets.DuneErosion.Data.Test/DuneLocationTest.cs	(.../DuneLocationTest.cs)	(revision c4ae90a1a5207672a7b4437d4f9aea1d301fb37a)
+++ Ringtoets/DuneErosion/test/Ringtoets.DuneErosion.Data.Test/DuneLocationTest.cs	(.../DuneLocationTest.cs)	(revision 75897942629adb76bc369ddc3a2bbb30b2bb4f06)
@@ -83,7 +83,10 @@
             Assert.AreEqual(offset, duneLocation.Offset.Value);
             Assert.AreEqual(orientation, duneLocation.Orientation.Value);
             Assert.AreEqual(d50, duneLocation.D50.Value);
-            Assert.IsNotNull(duneLocation.Calculation);
+            AssertDuneLocationCalculation(duneLocation.Calculation);
+            AssertDuneLocationCalculation(duneLocation.Calculation2);
+            AssertDuneLocationCalculation(duneLocation.Calculation3);
+            AssertDuneLocationCalculation(duneLocation.Calculation4);
         }
 
         [Test]
@@ -130,5 +133,11 @@
             Assert.AreEqual(6, duneLocation.D50.NumberOfDecimalPlaces);
             Assert.AreEqual(0.123457, duneLocation.D50, duneLocation.D50.GetAccuracy());
         }
+
+        private static void AssertDuneLocationCalculation(DuneLocationCalculation duneLocationCalculation)
+        {
+            Assert.IsNotNull(duneLocationCalculation);
+            Assert.IsNull(duneLocationCalculation.Output);
+        }
     }
 }
\ No newline at end of file