Reference characteristic &1 at material &2 has unusable table name: &3

What causes this issue?

In the configuration model, a reference characteristic exists with
reference to a table or structure which is not supported in any
configuration scenario.
In particular, only fields to the following database tables and
structures are supported: VBAK, VBAP, MAEPV, MAAPV, VEDA, VBKD, VBPA_AG,
VBADR_AG, VBPA_WE, VBADR_WE, VBPA_RG, VBADR_RG, VBPA_RE, VBADR_RE,
SDCOM, MMCOM, MARA, MARC, MAKT, STPO, STPOB, MDSP, PLPO, PLPOD, PLFLD,
PLFHD, ESLL, POSVID, PAMODD, VCSD_UPDATE, SCREEN_DEP, SRVCOM.

System Response

In the corresponding scenario (for example, in a purchase order), values
of this reference characteristic are not processed.
Exceptions, where such reference characteristic can be useful, are: a)
user-defined scenarios; b) reference characteristics which are defined
only to use the format and the input help from the data dictionary.

How to fix this error?

Check the configuration model.

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.