2.2. Planning bills
Since finished products are not stocked, their single bills represented in Fig. 3 no longer exist.
It would be necessary to have as many bills as there are finished products. In industrial reality this induces extremely important costs of data entry and maintenance of "les and stocks.
We found, in fact, in the case of a company that seeks to conciliate the mass production of make-to-stock products and the personalization of finished products. The distribution of the totality of the bills takes then the form of “diabolo” or `Ta. The level of `lesser costa corresponding to the level of the classic MPS generating the MRP situates then in the most narrow area, namely, to the level of common components [11].
It is then necessary to resort to planning bills (Fig. 4).
The finished product that was found at the top of the bill of material has been replaced by a family of products on which one determines commercial forecasts. These forecasts are then broken down into options at the second level of the MSP through the use of percentages. These percentages are determined using either sales records, or market trends, and needs in option are transmitted to material requirement planning (MRP) calculation which functions as in all classic MRP [15].