Usage of hierarchy &1 will be revoked next time you save

What causes this issue?

Hierarchy &V1& of characteristic &V2& was selected at an earlier point
in time for usage in Business Objects Explorer. In the meantime, this
hierarchy has been deleted, but the usage remains.

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

System Response

Next time it is saved, hierarchy &V1& of characteristic &V2& will be
automatically deselected for usage in InfoProvider &V3&.
The associated indexes will remain in BOE however. They cannot be
deleted until all usages of this hierarchy have been removed.

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.