Index: Ringtoets/Piping/src/Ringtoets.Piping.Plugin/PipingGuiPlugin.cs
===================================================================
diff -u -ra1de055e3698f610875e623d39f4526970568cef -r2ec08867a90646f09852fb338e18b70c6176b5ac
--- Ringtoets/Piping/src/Ringtoets.Piping.Plugin/PipingGuiPlugin.cs	(.../PipingGuiPlugin.cs)	(revision a1de055e3698f610875e623d39f4526970568cef)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Plugin/PipingGuiPlugin.cs	(.../PipingGuiPlugin.cs)	(revision 2ec08867a90646f09852fb338e18b70c6176b5ac)
@@ -759,7 +759,7 @@
             return GetAsIPipingCalculationItem(draggedData) != null && NodesHaveSameParentFailureMechanism(draggedData, targetData);
         }
 
-        private void PipingCalculationGroupContextOnDrop(object droppedData, object newParentData, object oldParentData, DragOperations operation, int position, TreeViewControl treeViewControl)
+        private void PipingCalculationGroupContextOnDrop(object droppedData, object newParentData, object oldParentData, int position, TreeViewControl treeViewControl)
         {
             IPipingCalculationItem pipingCalculationItem = GetAsIPipingCalculationItem(droppedData);
             var originalOwnerContext = oldParentData as PipingCalculationGroupContext;