Account Hierarchy - Available node list, lists all values

Summary

All values are listed instead of only non-used

Content

Hi all,

On the Account Hierarchy setup page, upon trying to add a new value to the tree, you get a popup.

In below example I'm trying to add a new value to parent '000'. But as you can see in red, values that have already been assigned to a parent also remain in the 'available node' list.

Is there anyway to disable this, to prevent from mistakes being made?
Thanks.

 

Version

R13 19C