What procss re-opens manually cloed PO's

I understand the invoice and receipt close tolerances, but am running through some test cases and can not recall what payables request will re-open PO's that do not meet the tolerances

Scenario:

Fully Receive and invoice a PO line, closure status goes to closed

Perform a return to supplier, PO line re-opens

Manually close the PO line without adjusting tolerances or quantity

Come in next day and PO line is now open becuase receipt close tolerance is 0

What is the process (I beleive it is some payables concurrent request) that re-opens the PO

Thanks