Supplier Spend authorization approval

I have a scenario where the client has multiple BU. And they are manually creating a supplier and promoting to spend authorized. When promoting the supplier to spend authorized the "Supplier Spend Authorization Approvals" is triggered and throws error.

I want to know in the above approvals how I can configure the approval as it should be triggered only for one BU and for other BU's it must auto approve.

Regards

Aswin S