3737668 - Why can I not see the Close/Reopen button on a purchase order created from SAP Fieldglass?

I cannot see the Reopen and Close buttons on a SAP Fieldglass purchase order in SAP Ariba Buying and Invoicing.

reopen button not visible, close button missing, purchase order header, order status closed, po reopen, po close, button visibility, Fieldglass purchase order, header actions, ariba buying, SAP Ariba buying and invoicing, po status, inspector closed field, reopen order, close purchase order , KBA , BNS-ARI-PUR-PO-CLO , Close Purchase Orders , Problem