Net requirement calculation

In this procedure you can schedule and run net requirement calculations in order to find shortages in the part register, and create suggestions based on this information. The new suggestions are added and the old suggestions are deleted.

You can also choose to run a continuous net requirement calculation. A continuous net requirement calculation only go through the parts that have been modified since the last net requirement calculation and the last continuous net requirement calculation.

The net requirement calculation is used to perform requirements planning based on the customer order backlog, as well as any existing sales forecasts. The list will automatically generate manufacturing and purchase order suggestions for several parts at a time, throughout all of the structure levels.

The parts for which order suggestions are created are the ones that will have shortages due to reservations originating from customer orders or material requirements from manufacturing orders. These suggestions can later be used to generate actual manufacturing and purchase orders in the Manufacturing order suggestion and Purchase order suggestion procedures.

In order to run the net requirement calculation, the part data must be correct. Otherwise, you will get incorrect order suggestions. In turn, this will generate incorrect actual orders. Before you run a net requirement calculation for the first time, you need to check the following part data:

• Balance – Make sure that all parts must have been stock counted and updated with the correct stock balance.
• Planning information – The parts must have correct values for safety stock/reorder point, safety time, lot sizing rule, order quantity, rounding quantity, and lead time.
• Supplier links – All purchased parts included in the net requirement calculation must have a default supplier link.

If a part is included in itself, the net requirement calculation will be suspended, since there are incorrect bills of material and no suggestions can be created. This way, any errors in the bases are quickly found.

As standard, a regular net requirement calculation is run for all manufactured and purchased parts in the entire part register. However, it is possible to change the selection and for example choose which parts to include in the calculation run.

A selection can be saved using the Save button on the toolbar. This way it is default the next time you start the procedure. This method differs from other selection procedures where you use the Save button to save modified valued in lists and use the function Default values in the backstage of the procedure to save selections.