Oracle Fusion Procurement :Difference between Preparer and Requestor

Requestor	Preparer	Buyer	Employee
Is an employee of the organization who will prepare the document note i.e, on behalf of requestor i.e., Requisition	Requestor is not buyer. Requestor only raise the indent	Who is able to buy the goods in the organization, buyer should be an employee before to buy goods.	Everyone in the organization should be an employee(Buyer, Preparer and requestor)
Data will store in po_requisition_lines_all,	Data will store in po_requisition_headers_all	po_agents - agent_id is the person_id from per_all_people_f	Employee - per_all_people_f - person_id