Short closure of released purchase requisitions and purchase orders

Hello All,

I've got 2 requirement from my client.

1) Short closure of released PR: Such documents can't be edited(closed) unless the releases are revoked. I have a doubt on "Change relase indicator assignment for the final approver to the Changable option".

Would this option help??

According my research, this would open the PR's and users may be able to edit the same and add new line items and this is a big risk.

Are there any other options available.

2) Short closure of released PO's : This requirement is also on similar lines

Can someone please help?

Regards,

Manoj