PO history about supplier name change

Hello,

We have unique requirement, client wants ability have history on PO / Invoice whenever if they rename supplier.  Currently PO and invoice gets updated once the supplier name updated hence they no way to track the commitment against what name.  Suppliers name change due to their merger with another group or while acquisition, however they get invoice on old name to closeout any outstanding commitment.  Currently they create new supplier for the new name and close all the POs / Invoices on old name, once all are corrected they inactivate the suppliers.  This  creates huge followup and manual activity.

They are looking to handle better way, if anyway the PO can be provide any history of when the supplier info got updated.  Since no revision happened on PO which makes very hard for them to track.