Enable duplicate AP invoice number check for same vendor across all BU

Summary:

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We have currently enabled a control to prevent users from being able to enter 2 invoices with the same invoice number for the same vendor. However, this control is specfic to a business unit. However we want to implement this rule across all BUs. i.e - we do not want anybody to process 2 invoices with the same invoice number for the same vendor across all the business units.

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