Configuration: no link to config. for configurable material

What causes this issue?

Although the material that you have entered has been created as a
<GL:configurable_material>configurable material</>, it has not yet
been configured.

System Response

INCLUDE 'KEINE-VERARBEITUNG' OBJECT DOKU ID TX LANGUAGE E

How to fix this error?

Choose a different configurable material, or have the material
configured by the appropriate person.

Error message extract from SAP system. Copyright SAP SE.