Lot Size Calculation 

Use

The system calculates the lot-size based on the lot-sizing procedure defined in the product master record in APO.

Prerequisites

You have maintained the lot size data and if you have assembly scrap, you have specified the percentage (only for products produced in-house) in the product master record in APO.

Process

  1. When planning the products, the system determines the shortage quantities for the relevant requirement dates. The shortage quantities must be covered by receipt elements.
  2. Based on the shortage quantity, the scrap and the total quantity to be produced are calculated. If no assembly scrap was defined in the product master record, the shortage quantity remains unchanged.
  3. The total quantity of the order is determined based on the lot size data that is maintained.

The following procedures can be used for lot-size calculation in APO:

The result of the lot-size calculation is the quantity to be produced or procured, which you can display or change in the order. You can also specify additional restrictions that should be considered in the lot-size calculation when maintaining the product master records.

These restrictions include:

A minimum purchase order quantity is defined per lot.

A maximum purchase order quantity is defined per lot.

A value is entered; multiples of which are used for rounding.

Staggered roundings can be made.

You entered a fixed lot size with 100 pieces and a scrap of 10% as the lot-sizing procedure in the product master record in APO. The requirement quantity (shortage determined) is 100 pieces.

1. Scrap calculation:

The system calculates the scrap and determines the total quantity of 111 pieces to be procured using the following formula:

Total quantity = 100 pieces (100% - 10%) = 100 pieces/0.9 = 111 pieces.

2. Calculation of the quantities to be procured:

111 pieces must be ordered. The fixed lot size is 100 pieces per order. As a result, the system generates two orders with 100 pieces per order.