SAP Message WB818 - Customer &1 is not the reference customer for layout module &2

Diagnosis
The customer is not the reference customer for the layout module.

System Response
When data is exported, this does not have any effect. The message is awarning only. The data relevant to the customer entered, and not thereference customer, is selected.

Procedure
Call the function module again with the correct reference customer ormaintain the layout module inCustomizing.