Fixed Pegging as Basis for Detailed Scheduling 

Purpose

In this scenario, fixed pegging is used to support detailed scheduling. The aim of this scenario is to enable you to reliably confirm sales orders, taking into account the availability of capacities and components. An online confirmation is only possible in the make-to-stock production scenario, if enough stock is already available.  If this is not the case, the new incoming orders are scheduled using detailed scheduling, taking the capacity and material availabilities into account. The sales orders are not confirmed until after planning and optimization.

Prerequisites

You have made the necessary settings.

Process Flow

       1.      Order receipt

You create the sales orders. If you work with make-to-stock production and enough stocks or receipt elements are available, you can carry out an ATP check as soon as the order is received and the system can confirm the order immediately, if applicable. However, this is not possible if you work with make-to-order production.

       2.      Execute MRP run

You carry out an infinite MRP run. In this MRP run the system plans products with planning file entries. The system creates the missing receipt elements on a multi-level basis.

       3.      Multi-level fixing of the material flow

You execute the heuristic SAP_PP_019 on a multi-level basis, taking into account the order priorities. On the basis of the finished product for each BOM level, the system creates fixed pegging relationships between the requirements and the receipt elements. Note that the system can only create fixed pegging relationships on all BOM levels if you select all products in the BOM structure for the planning run. The result of this processing step is a multi-level pegging structure, which the system has created on the basis of the finished product.

       4.      Carry out detailed scheduling

You now carry out finite planning in order to create a feasible production plan. You can use the PP/DS optimization and detailed scheduling heuristics to do this. Detailed scheduling schedules the orders on the basis of the fixed pegging relationships so that they are as near as possible to the requested dates. The quality of the detailed scheduling results depends on the criteria you have used to create fixed pegging relationships with the heuristic SAP_PP_019.

       5.      Deletion of fixed pegging relationships

You then delete all fixed pegging relationships using the heuristic SAP_PP_011.

       6.      Back order processing

In the last step, you carry out backorder processing (BOP) in order to get confirmed dates for the unconfirmed sales orders. Using backorder processing, an ATP check is carried out. For the ATP check, you can use the Production Type Standard or Characteristic Valuation. You can also carry out the ATP check against the checking horizon and take the scope of check into account. The system determines a confirmed date for all sales order that have not yet been confirmed. It also checks the sales orders that have already been confirmed again and, if necessary, creates new confirmation dates for them.