Sankey node placing with conditions


Please refer the png.

According to my data, every flow start with from a NON-HU node. Every middle and end nodes are HU nodes.

Some HU nodes may be repetitive
Ex: 78089->HU23->HU45->HU23

Here again come to HU23

Now the I want thing is.
in PNG first level of nodes shouldn’t be HU nodes. In the PNG it have HU104_2 and HU282_2

Is there any chance fot this.