The transferred characteristic &1 does not exist for the material &2

What causes this issue?

You want to assign a value for the characteristic &V1& to the material
&V2&. However, this characteristic is unknown, that is, it has not been
assigned within the <DS:GLOS.3526BC99AFAB52B9E10000009B38F974>material
group hierarchy</>. This error can occur in data transfer when using
the IDoc <LS>ARTMAS</> or the BAPI <LS>BAPI_MATERIAL_MAINTAINDATA_RT</>
to import material master data.

System Response

The classification data for the material cannot be created.

How to fix this error?

Check whether the characteristic transferred is correct. You may have
forgotten to assign it within the material group hierarchy.
If <DS:GLOS.3526BC17AFAB52B9E10000009B38F974>characteristics profiles
</> are used, and the characteristic has been assigned to a
characteristics profile, the relevant characteristics profile must also
be transferred in the IDoc or when the BAPI is called (see the
<DS:FU.BAPI_MATERIAL_MAINTAINDATA_RT>documentation</> for this BAPI).
Also make sure that the characteristics profile has been assigned to
the material group specified for this material.

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.