Closing of Purchase Orders

Dear Experts,

I have a client who runs two systems.Sap and Pastel

The procurement process is done in pastel and the supplier billing is done in SAP.

So they raise a purchase order in SAP and manually close it before going to pastel and receiving a bill from the vendor.At time users forget to manually close the purchase order.This has resulted into alot of purchase orders remaining open.

Could anyone know of a script i can run to change the status of all the purchase orders to closed?

Assistance will be appreciated .Thank you.!