The Purchase Order is the first step in the chain: the customer (university) sends the supplier(you) a Purchase Order, which defines what they want to buy, and how much they will pay, and any other terms. The supplier then sends an invoice, referencing the Purchase Order, to the customer, who will pay at some point.
Never do work without a purchase order if this is what they are using. Some organizations may take weeks to get one created. The place I used to work, someone would have to set the supplier up in the system, and someone else would have to approve that, then someone would have to set a part number up in the system, then someone would have to approve that, then someone would have to create the Purchase Order, and depending on the dollar value, other people would have to approve it. Then when the work is done, some one has to approve the invoice and send it to someone else to issue payment.
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