Our type of business requires purchasing materials on an agreed price per 1000kg with the supplier, but in unknown quantities. A supplier delivers a quantity of the materials which is measured is sorted by our operations. Operations team issues sorting results (and it may include new materials) and accordingly a PO is issued. Work performed by the operations team incurs cost per delivery. Right now the process of delivery and sorting is carried out manually (not in SAP).
I was wondering which is the best way using standard SAP to replicate the process in SAP. Following the standard path of Purchase Requisition and then Purchase Order does not seem right, as the right quantities and the exact number of materials appears after cost has incurred and after PR.
Thank you in advance for your answers.