Order form
A purchase order is a document that formalizes a business transaction between a supplier and a customer.
Although it is not mandatory, it is still a legal document between the two parties, thus committing them each to honor the provision of services or the delivery of a good on the supplier side, and the payment on the customer side, respectively.
This traceability also allows the proper monitoring of ongoing transactions, but also, in the case of service companies, the proper monitoring of projects and schedules.