Creating Multiple Supplier sites instead of Site Assignments under single site

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Creating Multiple Supplier sites instead of Site Assignments under single site

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Hi Experts,

In one of my client organizations during the initial implementation, if a supplier is dealing with multiple Business Units, the solution is given to create a single site under one BU and create multiple site assignments under that site for other BUs. There are Open POs and unpaid invoices under this current setup.

Now the client wants to remove the site assignments and create individual sites (using the same site address) for each BU under the same supplier.

If we do this, would there be an impact to the Open POs, Agreements and unpaid invoices? What is the best way to handle this?