Index: Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Data/GrassCoverErosionOutwardsFailureMechanismExtensions.cs
===================================================================
diff -u -rb2b9fdf365e70928a05c57966eeed30d9050e528 -rf5bac1f11df4ee4881109371c50120763e303642
--- Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Data/GrassCoverErosionOutwardsFailureMechanismExtensions.cs	(.../GrassCoverErosionOutwardsFailureMechanismExtensions.cs)	(revision b2b9fdf365e70928a05c57966eeed30d9050e528)
+++ Ringtoets/GrassCoverErosionOutwards/src/Ringtoets.GrassCoverErosionOutwards.Data/GrassCoverErosionOutwardsFailureMechanismExtensions.cs	(.../GrassCoverErosionOutwardsFailureMechanismExtensions.cs)	(revision f5bac1f11df4ee4881109371c50120763e303642)
@@ -25,7 +25,6 @@
 using Core.Common.Utils.Extensions;
 using Ringtoets.Common.Data.AssessmentSection;
 using Ringtoets.Common.Data.Hydraulics;
-using Ringtoets.GrassCoverErosionOutwards.Data.Properties;
 
 namespace Ringtoets.GrassCoverErosionOutwards.Data
 {
@@ -73,17 +72,12 @@
         /// <param name="assessmentSection">The <see cref="IAssessmentSection"/> which contains the assessment section norm.</param>
         /// <returns>The value of the failure mechanism norm.</returns>
         /// <exception cref="ArgumentNullException">Thrown when <paramref name="assessmentSection"/> is <c>null</c>.</exception>
-        /// <exception cref="ArgumentException">Thrown when <paramref name="failureMechanism"/> has no (0) contribution.</exception>
         public static double GetMechanismSpecificNorm(this GrassCoverErosionOutwardsFailureMechanism failureMechanism, IAssessmentSection assessmentSection)
         {
             if (assessmentSection == null)
             {
                 throw new ArgumentNullException(nameof(assessmentSection));
             }
-            if (!(failureMechanism.Contribution > 0))
-            {
-                throw new ArgumentException(Resources.GrassCoverErosionOutwardsFailureMechanismExtensions_GetMechanismSpecificNorm_Contribution_is_zero);
-            }
 
             return assessmentSection.FailureMechanismContribution.Norm
                    *(failureMechanism.Contribution/100)