Supplier &1 not maintained
Message type: E = Error
Message class: WN - Plant master data maintenance (integrated)
Message number: 503
Message text: Supplier &1 not maintained
What causes this issue?
A vendor who has not been created in the system is assigned to the
plant.
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?
Error message extract from SAP system. Copyright SAP SE.