Plant &1 is not supplied by purch. org. &2

What causes this issue?

The plant &V1& which you have entered is not supplied by purchasing
organization &V2&.

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 check your entries again or check your Customizing settings, if
necessary.

Error message extract from SAP system. Copyright SAP SE.