Index: Ringtoets/Common/src/Ringtoets.Common.Forms/PropertyClasses/StructuresInputBaseProperties.cs
===================================================================
diff -u -re6cb95313c163aebfb0f01470855068785ce61bb -rf3c7ae4cc9069268dba97e9dd691bf449fa393db
--- Ringtoets/Common/src/Ringtoets.Common.Forms/PropertyClasses/StructuresInputBaseProperties.cs	(.../StructuresInputBaseProperties.cs)	(revision e6cb95313c163aebfb0f01470855068785ce61bb)
+++ Ringtoets/Common/src/Ringtoets.Common.Forms/PropertyClasses/StructuresInputBaseProperties.cs	(.../StructuresInputBaseProperties.cs)	(revision f3c7ae4cc9069268dba97e9dd691bf449fa393db)
@@ -349,6 +349,7 @@
             }
         }
 
+        [DynamicReadOnly]
         [DynamicPropertyOrder]
         [ResourcesCategory(typeof(Resources), nameof(Resources.Categories_Schematization))]
         [ResourcesDisplayName(typeof(Resources), nameof(Resources.Structure_StructureNormalOrientation_DisplayName))]
@@ -375,7 +376,9 @@
             get
             {
                 return new LogNormalDistributionProperties(
-                    DistributionPropertiesReadOnly.None,
+                    HasStructure()
+                        ? DistributionPropertiesReadOnly.None
+                        : DistributionPropertiesReadOnly.All,
                     data.WrappedData.FlowWidthAtBottomProtection,
                     PropertyChangeHandler);
             }
@@ -391,7 +394,9 @@
             get
             {
                 return new NormalDistributionProperties(
-                    DistributionPropertiesReadOnly.None,
+                    HasStructure()
+                        ? DistributionPropertiesReadOnly.None
+                        : DistributionPropertiesReadOnly.All,
                     data.WrappedData.WidthFlowApertures,
                     PropertyChangeHandler);
             }
@@ -407,7 +412,9 @@
             get
             {
                 return new VariationCoefficientLogNormalDistributionProperties(
-                    VariationCoefficientDistributionPropertiesReadOnly.None,
+                    HasStructure()
+                        ? VariationCoefficientDistributionPropertiesReadOnly.None
+                        : VariationCoefficientDistributionPropertiesReadOnly.All,
                     data.WrappedData.StorageStructureArea,
                     PropertyChangeHandler);
             }
@@ -423,7 +430,9 @@
             get
             {
                 return new LogNormalDistributionProperties(
-                    DistributionPropertiesReadOnly.None,
+                    HasStructure()
+                        ? DistributionPropertiesReadOnly.None
+                        : DistributionPropertiesReadOnly.All,
                     data.WrappedData.AllowedLevelIncreaseStorage,
                     PropertyChangeHandler);
             }
@@ -439,7 +448,9 @@
             get
             {
                 return new VariationCoefficientLogNormalDistributionProperties(
-                    VariationCoefficientDistributionPropertiesReadOnly.None,
+                    HasStructure()
+                        ? VariationCoefficientDistributionPropertiesReadOnly.None
+                        : VariationCoefficientDistributionPropertiesReadOnly.All,
                     data.WrappedData.CriticalOvertoppingDischarge,
                     PropertyChangeHandler);
             }
@@ -550,5 +561,21 @@
         }
 
         #endregion
+
+        protected bool HasStructure()
+        {
+            return data.WrappedData.Structure != null;
+        }
+
+        [DynamicReadOnlyValidationMethod]
+        public bool IsReadOnly(string property)
+        {
+            if (property == nameof(StructureNormalOrientation))
+            {
+                return !HasStructure();
+            }
+
+            return false;
+        }
     }
 }
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