Retrigger Release Strategy in Purchase order

Hi Experts,

We have a requirement to re-trigger the release strategy (after it is approved) in the Purchase order, when the payment terms is changed in the PO. We have added payment term to CEKKO structure (as USRC1 field) and we have maintained the changeable parameter as 4 (shown below) for Release ID 'G'. However, we are not able to retrigger the approval process (it can be the same release strategy which was approved earlier) and get the PO back in blocked status.

Please guide me.

Thank you.