Supplier Shipping Schedules > Creating a Schedule Release from MRP
  
Creating a Schedule Release from MRP
Use Schedule Update from MRP (5.5.3.1) to create releases of supplier schedules. A release is a set of item quantities (requirements) and requirement dates identified by a release ID number, which is then sent to your supplier. A single schedule release can include both planning and shipping schedules.
See Creating a Schedule Release.
Note: MRP planned orders for a co-product/by-product or a base process item cannot be used to update supplier schedules.