In this process you create or modify the demand forecast. You can plan both online and in the background. Typically, you do a planning run for multiple products in the background with mass processing, and then adjust the figures interactively on the demand planning desktop. You can also work in interactive demand planning to validate different forecast models.
DP supports top-down, middle-out and bottom-up planning. Top-down planning means planning on a high level. Middle-out planning means planning on a medium level. Bottom-up planning means planning on a detailed level. For example, you can plan demand for either a whole region, or each of the divisions within the region, or each of the products in each division within the region.
1. You have defined the Calculation type and Time-based aggregation for each key figure in the planning area. This is done in the Customizing activity Administration for Demand Planning and Supply Network Planning.
2. You have created planning books and data views.
3. You have defined the forecast models.
4. You have created "like" models for products without demand history.
5. You have created phase-in and/or phase-out profiles for products whose lifecycles you want to model.
Whatever planning approach you adopt, the data is always stored consistently. For example, if you have three products in a division with demand for each product planned at $3 million, then planned total demand for the division is automatically $9 million. If you change the demand plan for the division to $12 million, then planned demand for each product automatically changes to $4 million. There is no difference between the demand plan for the division and the sum of the demand plans for all of its products. The functions by which planning data is summed and distributed are known as aggregation and disaggregation (see Aggregation and Disaggregation).