Setup > Vendors.

 for the vendor and under the "Actions"

 column, click on "Edit". 

 window will pop up, then go to the "Options"

 tab and check the box "Allow creating POs", click on "Save". 

Once the vendor has this option activated. The vendor can start creating purchase orders. The option will appear under the Purchase

Order > Purchase Order Summary > Create New

Order green button. Once the PO is created its Status is Confirmed and the vendor can proceed to add the PO to

an AWB (or automatically added to a temporary AWB, for more information please read How to Create a Temporary AWB)