If an order start date which lies in the past is calculated by backward scheduling for either the MRP or the forecast-based planning procedure, the system automatically switches to forward scheduling in order to receive realistic scheduling data.
Forward scheduling is always carried out for reorder point planning.
Process Flow
The current date is entered as the order start date. The system adds the in-house production time to the current date and thereby calculates the order finish date.
The system adds the goods receipt processing time to the order finish date and thereby calculates the availability date. On this date, the material is available.
Forward Scheduling for External Procurement 
