Error in billing item &1/&2: material &3 does not exist

What causes this issue?

Article &V3& from billing item &V1& / &V2& does not exist in material
master data.

System Response

The billing item can not be processed.

How to fix this error?

Please check material &V3& in REA article master data and in SAP master
data.

Error message extract from SAP system. Copyright SAP SE.