This issue can happen if you import a database from a different server and the Add-on stores multiple license data for multiple systems.
In order to eliminate this message you have to remove the entries that store data from the other SBO environment.
Check the Boyum licenses by using the following query:
select "U_BOY_INSTALNO", * from "@BOY_SBO_LICDATA"
Check the SAP Installation number on the About box of SBO
Delete the rows that contain different SAP Installation number and restart the Add-on
delete from "@BOY_SBO_LICDATA" where "U_BOY_INSTALNO" <> '0020304139';