Cost Center hierarchy REST_H was shown in the App Cost Centers - Actuals, although it was not created at all in the App Manage Global Hierarchies.
SAP S/4HANA Cloud
Reproducing the Issue
Check in App Cost Centers - Actuals.
Select any hierarchy for the cost center field.
There need to be a hierarchy to display the cost centers which are not included in the selected hierarchy. The costs centers will be shown in the default hierarchy REST_H.
This is the standard design.
cost center group , KBA , CO-OM-IS , Information System, iViews , CO-FIO , Fiori UI for Overhead Cost Controlling , Problem