How to restrict duplicate invoice number across business units

Organization Name (Required - If you are an Oracle Partner, please provide the organization you are logging the idea on behalf of):

MS AMLIN

Description (Required):

How to restrict duplicate invoice number across business units

Use Case and Business Need (Required):

we noticed that invoices with the same invoices number can be booked to different business units without the system noticing the duplicate invoice.

This should be changed duplicate invoice numbers should be recognized through all business units

it happened now twice that an invoice with the same invoice number was paid twice from different BU's.

Please suggest anything we can do to restrict this.