The self-service requisitioning process typically begins with the usage of the fiori-based Create Purchase Requisition app by an employee to request for a desired materials or services. The supervisor or designated approver(s) then approve the purchase requisition. Afterwards, the PR is converted to a PO by the buyer. On receipt of material or service, the employee performs a goods receipt or service entry and then the accounts payable officer processes the invoice. All the above transactions can be done on Fiori, thereby guaranteeing a friendly user experience.
Michael Management Corporation offers a course on the entire Purchase Process Cycle in S/4HANA.