Invoice Workflow Approval for a paid invoice

Hello All,

We have an Invoice 5678 for a supplier XYZ was enterd and paid on Oct 2013. The accounting on the invoice was adjusted in December. Invoice approval was required again after the invoice was revalidated after adjustment. Adjustments on paid invoices should not trigger a re-approval on AP invoices. Please help me how not to send the paid invoice for invoice work flow again.

Do we need to change approval rules to discard the paid invoice? If yes, Please let me know how it need to be done as i am new to AME/Approval Workflow.

Thanks,

Tom