System Creating Reservation instead of PO

Hello All Experts, 

One question, presently for Network-Materials strategy is creating Reservation alternatively of PO. 

What settings/configuration I request to bash oregon required, truthful that strategy volition commencement creating PO and not Reservation. 

Business wants PO to beryllium created for Network-Material. 

Expert's guidance volition beryllium appreciated. 

Thank you. 

Regards,

Tanuj K.