diff --git a/StructureHelper/Windows/ViewModels/Forces/ActionsViewModel.cs b/StructureHelper/Windows/ViewModels/Forces/ActionsViewModel.cs
index bc4e15f..86ee3d5 100644
--- a/StructureHelper/Windows/ViewModels/Forces/ActionsViewModel.cs
+++ b/StructureHelper/Windows/ViewModels/Forces/ActionsViewModel.cs
@@ -52,7 +52,15 @@ namespace StructureHelper.Windows.ViewModels.Forces
             }         
         }
 
-
+        public override void CopyMethod(object parameter)
+        {
+            NewItem = SelectedItem.Clone() as IForceAction;
+            NewItem.Name = $"{NewItem.Name} copy";
+            GlobalRepository.Actions.Create(NewItem);
+            Collection.Add(NewItem);
+            Items.Add(NewItem);
+            SelectedItem = NewItem;
+        }
 
         public override void EditMethod(object parameter)
         {
diff --git a/StructureHelper/Windows/ViewModels/Materials/MaterialsViewModel.cs b/StructureHelper/Windows/ViewModels/Materials/MaterialsViewModel.cs
index 11614c6..e8eca2c 100644
--- a/StructureHelper/Windows/ViewModels/Materials/MaterialsViewModel.cs
+++ b/StructureHelper/Windows/ViewModels/Materials/MaterialsViewModel.cs
@@ -87,6 +87,7 @@ namespace StructureHelper.Windows.ViewModels.Materials
             Items.Add(NewItem);
             SelectedItem = NewItem;
         }
+
         private void AddElastic()
         {
             var material = HeadMaterialFactory.GetHeadMaterial(HeadmaterialType.Elastic200);
diff --git a/StructureHelperLogics/NdmCalculations/Analyses/RC/InputDataFactory.cs b/StructureHelperLogics/NdmCalculations/Analyses/RC/InputDataFactory.cs
index ed5f010..fff657b 100644
--- a/StructureHelperLogics/NdmCalculations/Analyses/RC/InputDataFactory.cs
+++ b/StructureHelperLogics/NdmCalculations/Analyses/RC/InputDataFactory.cs
@@ -1,4 +1,5 @@
 using LoaderCalculator.Data.Matrix;
+using LoaderCalculator.Data.Ndms;
 using LoaderCalculator.Logics;
 using StructureHelperCommon.Infrastructures.Enums;
 using StructureHelperCommon.Infrastructures.Exceptions;
@@ -30,7 +31,9 @@ namespace StructureHelperLogics.NdmCalculations.Analyses.RC
                 throw new StructureHelperException(ErrorStrings.DataIsInCorrect + ": main material is incorrect or null");
             }
             var triangulationOptions = new TriangulationOptions() { LimiteState = limitState, CalcTerm = calcTerm };
-            var ndm = ndmPrimitive.GetNdms(triangulationOptions).Single();
+            var ndms = ndmPrimitive.GetNdms(triangulationOptions);
+            var ndm = ndms.Where(x => x is RebarNdm)
+                .Single();
             if (strainMatrix is not null)
             {
                 inputData.ReinforcementStress = stressLogic.GetStress(strainMatrix, ndm);