How to disable the approval withdraw option for fully paid invoices?

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There are some invoices where the workflow is fully approved and fully paid. Our client accidentally withdraws the invoice and resubmit it for approval workflow again.

1) Can we disable the approval withdrawal option for fully paid invoices? 

2) What is the impact if we accidentally click withdraw and do not resubmit? So the requestor/approvers do not have to approve twice on the same invoice.

Please advise!

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