# Cannot adjust data hierarchy in DataModule
**URL:** https://discourse.slicer.org/t/cannot-adjust-data-hierarchy-in-datamodule/1245
**Category:** Support
**Tags:** surgical-navigation
**Created:** [October 19, 2017, 7:57am UTC](https://discourse.slicer.org/t/cannot-adjust-data-hierarchy-in-datamodule/1245 "2017-10-19T07:57:51Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@shenziheng](https://discourse.slicer.org/u/shenziheng)
#### Post date: [October 19, 2017, 7:57am UTC](https://discourse.slicer.org/t/cannot-adjust-data-hierarchy-in-datamodule/1245/1 "2017-10-19T07:57:51Z")
Hi,
I want to try image-guided surgery using slicer developed module.
The main Notes (displayed in data module) include :
1. Ultrasound ( `vtkMRMLVolumeNode` , real time transmission by openigtlink module through a image grabber connected with ultrasound machine)
2. `ImageToProbe` (constant linear transform), `ProbeToTracker` (real time linear transform acquired by NDI and transmitted by openigt module ) Their data type are both `vtkMRMLLinearTransformNode`.
And with the help of openigtlink module, the hierarchy in Data module likes:
```auto
|--Ultrasound
|--ImageToProbe
|--ProbeToTracker
In oder to realize the function of image-guieded surgery, I need to transform Images (Ultrasound) from image coordinate system to tracker coordinate system. so I choose to adjust hierarchy ( draging nodes):
|--ProbeToTracker
|------ImageToProbe (success)
|----------Ultrasound (fail)
```
I have tried many times, but failed to drag "ultrasound "node to the lower level of `ImageToProbe` node.
More details about my system configuration are:
Windows7 Slicer 4.5 Visual Studio2013
---
### Author:  [@cpinter](https://discourse.slicer.org/u/cpinter)
#### Post date: [October 19, 2017, 12:42pm UTC](https://discourse.slicer.org/t/cannot-adjust-data-hierarchy-in-datamodule/1245/2 "2017-10-19T12:42:46Z")
Hi! This was a known issue but it has been fixed since the release of 4.5 that was two years ago. 4.8 was released yesterday, please try with that. Thanks!