Material &2 not found for JIT customer &1

What causes this issue?

Material &V2& has not been found for JIT customer &V1&.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Please define an SD scheduling agreement for customer &v1& concerning
material &v2&. The scheduling agreement data will be copied
automatically. You might also need to add the JIT material table, to
allow the repetitive manufacturing backflush for the material
(indicator: backflush).

Error message extract from SAP system. Copyright SAP SE.