Unable to find referencing specifications that meet the search criteria

What causes this issue?

You activated the input help for a reference field. The system is
unable to find a specification that meets the search criteria
<ZH>and</> can be referenced. The system only filters out for selection
from the set of hits those specifications that can be referenced.
A specification cannot be referenced in the following two cases:
If it is of a specification type that cannot be referenced
(->Customizing)
If it has references itself. The system does not permit dual-level
referencing.

System Response

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

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.