1, PO refers to the purchase order, and two POs are two orders. The general operation is that after negotiating the price with the guest, the guest sends a PO, and you make a sales contract or a proforma invoice. The order can not be officially confirmed until the guest signs back.

2.PI is a proforma invoice, not a proforma invoice.

Proforma invoice is also called advance invoice.

At the request of the importer, the exporter will sometimes issue an informal reference invoice indicating the name, specification, quantity, unit price and estimated total value of the exported goods, so that the importer can apply for an import license and approve foreign exchange from the local financial or foreign trade management authorities. Because it is not a formal document, it can neither be used as a basis for accounting for both parties to the transaction, nor can it be used for collection and negotiation, nor can it be binding on both parties to the transaction. When the contract is formally concluded, it is still necessary to open another official invoice to expand the information according to the relevant regulations.

A purchase order is a feasible purchase order plan made by an enterprise according to the material plan and actual production capacity of the product and related factors, and issued to the supplier for execution. In the process of implementation, we should pay attention to tracking orders, so that enterprises can buy the required goods from the procurement environment and deliver qualified raw materials and accessories to the production department and demand department.