PO approval notification is closed - PO status -In Process - how to resubmit

Greetings !!!

We are using R12.1.3

For Purchase Order approval we are using 'Position Hierarchy'.

one PO submitted for approval

One of the approval member  - instead of  'Reject'  he  forwarded  to himself (thinking  he is forwarding to another person).

Presently  notification  ID  in 'CLOSED'  status  and Purchaser order status in 'INPROCESS'

Now the purchase user need to re submit the PO for approval.

Can you please provide  steps of actions.

Thanks

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