Deleting and Renaming Approval Unit Hierarchies
You can delete an approval unit hierarchy if it is not referenced by data validation rules or scenario assignments. The Usage tab displays objects that reference the hierarchy so that you can disassociate them from the hierarchy if needed.
You can also change the name of an approval unit hierarchy. Renaming an approval unit hierarchy does not affect the objects that reference it.
Note that you cannot delete an Approval Unit Hierarchy if it is already assigned to a Scenario/Year/Period in Approval Unit Hierarchy assignment.
To delete or rename approval unit hierarchies: