3816850 - Why am I unable to change the Vendor on my Invoice?

I would like to change the Vendor on an Invoice, however the option to do so is not available. How can I have the ability to make this change?

Invoice > Invoice Settings

Concur Invoice all versions

Client would like to know why they are unable to change Vendor on their Invoice , KBA , CON-REQ-ADM-CRP , Country / Region Groups , Problem

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