Index: DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/CharacteristicPointSet.cs
===================================================================
diff -u -r877 -r1408
--- DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/CharacteristicPointSet.cs	(.../CharacteristicPointSet.cs)	(revision 877)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/CharacteristicPointSet.cs	(.../CharacteristicPointSet.cs)	(revision 1408)
@@ -410,8 +410,24 @@
                         }
                     }
                 }
-                PerformListInsertWithEvents(Geometry.Points, item.GeometryPoint, geometryIndex);
-            }
+                // Check if point at same position already exists and set that point to the existing point
+                // Do this to avoid points in Surfaceline.Geometry with the same location
+                bool IsPointExist = false;
+                for (int i = 0; i < Geometry.Points.Count; i++)
+                {
+                    if (Geometry.Points[i].LocationEquals(item.GeometryPoint))
+                    {
+                        item.GeometryPoint = Geometry.Points[i];
+                        IsPointExist = true;
+                        break;
+                    }
+                }
+                if (!IsPointExist)
+                {
+                    // Only add new point if no point on same location was found
+                    PerformListInsertWithEvents(Geometry.Points, item.GeometryPoint, geometryIndex);
+                }
+           }
 
             UpdateCharacteristicPointHeight(item);
             UpdateTypeCache(item);