Material &1 has status &3 in plant &2

What causes this issue?

In the material master record, the <GL:material_status>material
status</> (field "MAT/PPC status") has been maintained. This means that
use of the material can be restricted.

System Response

Depending on the status, the system issues either a warning message or
an error message.

How to fix this error?

If the message is a warning message, press ENTER to continue
processing.
If the message is an error message, you cannot post the transaction.

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

Error message extract from SAP system. Copyright SAP SE.