Material & in plant & must not be costed

What causes this issue?

The customer exit for the selection of materials to be costed was used
to stipulate that material &V1& in plant &V2& with costing variant &V3&
and costing version &V4& must not be costed.

System Response

Material is not costed.

How to fix this error?

Check your customer exit for the selection of materials to be costed.

Error message extract from SAP system. Copyright SAP SE.