For Which Point in Time Is the ATP Check Carried Out?
Backward Scheduling
For backwards scheduling, the customer’s requested delivery date is used to calculate the material availability date and the transportation lead time. The outbound delivery must be created at the earliest of the two dates (selection date for the outbound delivery). The material must be available on the material availability date, since only then the shipping process can begin.
If both dates are after the date on which the order was created and the material is available on the material availability date, the customer’s requested delivery date can be confirmed. A schedule line is created for the sales document item. The date of the schedule line displays the confirmed delivery date, which is the same as the customer’s requested delivery date.
If one of the two dates is before the order date or if the material is not available on the material availability date, the requested delivery date cannot be confirmed. Therefore, the system attempts to determine the next possible delivery date (forward scheduling).