Index: Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.Data/FailureMechanismSectionAssembly.cs
===================================================================
diff -u -r144cb07347cd17b0acc84c405264f0a36f9acff3 -r02f4247d6ea76d5f756af413b9c0bf500e5c263f
--- Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.Data/FailureMechanismSectionAssembly.cs	(.../FailureMechanismSectionAssembly.cs)	(revision 144cb07347cd17b0acc84c405264f0a36f9acff3)
+++ Ringtoets/AssemblyTool/src/Ringtoets.AssemblyTool.Data/FailureMechanismSectionAssembly.cs	(.../FailureMechanismSectionAssembly.cs)	(revision 02f4247d6ea76d5f756af413b9c0bf500e5c263f)
@@ -31,7 +31,7 @@
         /// </summary>
         /// <param name="probability">The probability of the assembly.</param>
         /// <param name="group">The group of the assembly.</param>
-        public FailureMechanismSectionAssembly(double? probability, FailureMechanismSectionAssemblyCategoryGroup group)
+        public FailureMechanismSectionAssembly(double probability, FailureMechanismSectionAssemblyCategoryGroup group)
         {
             Probability = probability;
             Group = group;
@@ -40,7 +40,7 @@
         /// <summary>
         /// Gets the probability of the assembly.
         /// </summary>
-        public double? Probability { get; }
+        public double Probability { get; }
 
         /// <summary>
         /// Gets the group of the assembly.