diff --git a/mevislab.github.io/content/tutorials/basicmechanisms/coordinatesystems/coordinatesystems.md b/mevislab.github.io/content/tutorials/basicmechanisms/coordinatesystems/coordinatesystems.md
index 1c6a88ee5..5bfcff143 100644
--- a/mevislab.github.io/content/tutorials/basicmechanisms/coordinatesystems/coordinatesystems.md
+++ b/mevislab.github.io/content/tutorials/basicmechanisms/coordinatesystems/coordinatesystems.md
@@ -89,6 +89,10 @@ The voxel size is now 1.
 
 You can add this network to the world coordinate system network developed above and see both coordinate systems.
 
+{{<alert class="warning" caption="Warning">}}
+Replace the `SoGroup` module from the World Group in your network by a `SoSeparator`. Additional details about the difference can be found [here](https://mevislab.github.io/examples/tutorials/openinventor).
+{{</alert>}}
+
 ![World coordinates of the loaded image](/images/tutorials/basicmechanics/WorldVoxelNetwork.png "World coordinates of the loaded image")
 
 Opening the `SoExaminerViewer` shows the world coordinate system in white and the voxel coordinate system in yellow.
diff --git a/mevislab.github.io/content/tutorials/basicmechanisms/macromodules/itemmodelview.md b/mevislab.github.io/content/tutorials/basicmechanisms/macromodules/itemmodelview.md
index 45aabad55..8db3421fc 100644
--- a/mevislab.github.io/content/tutorials/basicmechanisms/macromodules/itemmodelview.md
+++ b/mevislab.github.io/content/tutorials/basicmechanisms/macromodules/itemmodelview.md
@@ -1,5 +1,5 @@
 ---
-title: "Example 7: Creating you own ItemModel by using the ItemModelView"
+title: "Example 7: Creating your own ItemModel by using the ItemModelView"
 date: 2025-06-03
 status: "OK"
 draft: false
@@ -169,6 +169,11 @@ from mevis import MLAB
 gAttributes = ["patientName", "patientBirthdate", "studyDescription", "studyDate", "modality", "seriesDescription", "seriesDate", "sopInstanceUID"]
 gModel = None
 gNextId = 0
+
+def getNextId():
+    global gNextId
+    gNextId += 1
+    return gNextId
 ```
 {{</highlight>}}