In SAP system, when creating PO with ME2 1N, what is the use of the purchasing organization in the header of the purchase order?

The purchasing organization is the organizational level of the SAP material module, which is used to divide the functions of the purchasing department of an enterprise. For example, purchasing departments can be divided into: foreign material purchasing organizations and domestic material purchasing organizations, material purchasing organizations and service purchasing organizations. Through purchasing organization, the functional scope, suppliers and prices of each department are divided to facilitate management. Generally, one purchasing organization is enough for small enterprises, so no matter what purchase order you place, the purchasing organization is the same.