Customer & is not assigned to a plant master

What causes this issue?

Retail-specific data exists for a customer. However, the customer has
not been assigned to a plant master.

System Response

The system cannot process the data.

How to fix this error?

Assign a plant to customer &V1& using transaction <DS:TRAN.WB01>Plant
Create</>. You can then process the Retail-specific data using the
plant master transactions.
If the customer does not exist in the system either, you can create
this when you create the plant.

Error message extract from SAP system. Copyright SAP SE.