Pi refers to "proforma invoice", which is translated into proforma invoice in Chinese. Refers to the invoice issued by the seller to the buyer, clearly indicating the detailed specifications, quantity, price and other information of the goods to the buyer in advance. Pi plays a very important role in foreign trade transactions, because it is the basis of negotiations between the two sides, which can ensure the accurate record of the detailed information of the transaction. Before the contract is signed, pi is also an important communication bridge between buyers and sellers.

The following aspects should be considered when filling in pi: commodity name, quantity, price, payment method, delivery terms, mode of transportation, contact person, address, etc. This information should be as detailed and accurate as possible. In addition, we should also pay attention to the filling date, and pi should be as close as possible to the contract signing date. Be careful and patient when filling out the form. If you don't fill in the right number at all, or even fill in the wrong number, it will lead to problems in subsequent transactions and affect the interests of buyers and sellers.

Pi is a very important document, which can help buyers and sellers to confirm the details of the transaction, promote the smooth progress of the transaction and protect the rights and interests of both parties. For the buyer, pi can be used as the basis for applying for a letter of credit, which can determine the payment method and time limit and protect the rights and interests of exporters. For sellers, pi can be used as the basis for actual operations such as transaction and collection. Therefore, the accuracy and integrity of the whole pi have a vital impact on the smooth and legal transaction between the two parties.