&1 &2 Cost center not assigned to standard hier. &3 in controlling area

What causes this issue?

The cost center must be assigned to the standard hierarchy for the
corresponding controlling area.

System Response

If this message is a warning, you can still save the data. If this is an
error message, you first have to assign the cost center to the standard
hierarchy.

How to fix this error?

To assign the cost center to the standard hierarchy, you need to choose
the entity type <LS>cost center group</> and the relevant controlling
area in mass processing. This takes you into hierarchy maintenance where
you can assign the cost center to the standard hierarchy.
If the standard hierarchy does not appear in the list of hierarchies, it
still has to be created. You can do this using single maintenance or
from hierarchy maintenance.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.