Backward Scheduling for External Procurement

With materials that are planned using the forecast-based planning procedure and the MRP procedure, the requirement dates in the future are already known. The materials must be ready on these dates. The release date for purchasing is determined by scheduling, that is, the date that the materials must be ordered, so that they are available for the requirement date. Thus, the system starts with the requirements date and then schedules backwards to determine the release date of the purchase requisition. This procedure is referred to as backward scheduling.