Index: Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Data/GrassCoverErosionInwardsCalculation.cs
===================================================================
diff -u -r6df492af2166d167f1a154b7997c85a4118b1759 -r65813dfccc471aa70736029d498d71ac0403c02d
--- Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Data/GrassCoverErosionInwardsCalculation.cs	(.../GrassCoverErosionInwardsCalculation.cs)	(revision 6df492af2166d167f1a154b7997c85a4118b1759)
+++ Ringtoets/GrassCoverErosionInwards/src/Ringtoets.GrassCoverErosionInwards.Data/GrassCoverErosionInwardsCalculation.cs	(.../GrassCoverErosionInwardsCalculation.cs)	(revision 65813dfccc471aa70736029d498d71ac0403c02d)
@@ -51,10 +51,16 @@
         /// </summary>
         public GrassCoverErosionInwardsOutput Output { get; set; }
 
-        public Comment Comments { get; private set; }
-
         public string Name { get; set; }
 
+        public bool ShouldCalculate
+        {
+            get
+            {
+                return !HasOutput;
+            }
+        }
+
         public bool HasOutput
         {
             get
@@ -63,6 +69,8 @@
             }
         }
 
+        public Comment Comments { get; private set; }
+
         /// <summary>
         /// Returns a string that represents the current object.
         /// </summary>