Which priviledges require to authorized PO?

In Purchase Order user can provided privileges to approve or reject Purchase Order.

1) Switch to Back

2) edit outlet in which you want to provide approval purchase order privilege from Other Settings. Refer above screenshot.

3) Once it's done provide user level privileges to whom you want to allow approval purchase order privileges.

4) Once provide above privileges to user and outlet levels system allow you to approve or reject PO from eZee Optimus Front.