Scheduling for External Procurement 
Implementation Options
Only the basic dates for procurement elements are determined for external procurement.
Prerequisites
- You have entered the purchasing processing time (workdays) in Customizing for MRP either in Plant parameters or in the IMG activity Define external procurement.
- You have determined the planned delivery time (calendar days) in the material master (view MRP 2).
- You have determined the goods receipt processing time (in workdays) in the material master (view MRP 2).
Process Flow
In the MRP and forecast-based planning procedures, backward scheduling is used to determine the basic dates. In reorder point planning, however, the basic dates are determined by forward scheduling.
- For the planned order this includes the order start date and the order finish date.
- For the purchase requisition, the following dates are determined:
- The delivery date (which corresponds to the order finish date)
- The release date (which corresponds to the order start date)