Plant & does not exist in T001W.

What causes this issue?

The plant entered is not maintained in <GL:Customizing>Customizing</>
Table T001W.

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?

Check your entry.
Maintain Table T001W.
INCLUDE 'NA_CKSYSAD_AN'

Error message extract from SAP system. Copyright SAP SE.