WYS’s Demand Planning engine controls the processing of balancing demand and supply. Once demand trends have been evaluated and the plan created, the supply planning process kicks in and tries to generate purchase, work and transfer orders based on the many settings found on the item record. Period of Supply, Lot for Lot and Fixed are amongst the methods used to determine the number and size of the orders generated, while also looking at consumption, time fence and reschedule in/out parameters.