Material &1 has status "&3" in plant &2

What causes this issue?

External procurement has not been defined for the
<GL:material_status>material status</> of the
<GL:material_master_record>material master record</> you entered.

How to fix this error?

You can continue your current processing.
Check the material status in the purchasing data of the material master
record for correctness.
You can change the material status in the purchasing data of the
material master record if you are authorized to do so. If you do not
have the relevant authorization, inform the individual or section
responsible for material master record maintenance.

Error message extract from SAP system. Copyright SAP SE.