| To compute phase numbers for order-based planning |  |
| ERP LN bases the phase number for order-based planning on the following data: Bill of material (BOM) Supplying relationships ERP LN computes a phase number for each plan item. Criteria for phase numbers The phase numbers of the plan units must conform to the following criteria: If a plan items is defined as a component of another plan item in a BOM, the phase number of the component must be greater than the phase number of the parent. A plan item must have the same phase number as any of the use-up materials and alternative materials of that plan item. If a supplying relationship exists between two plan items that belong to the same site, the phase number of the supplying item must be greater than the phase number of the receiving item. If a supplying relationship exists between two plan items, and both items are controlled by central multisite planning, the phase number of the supplying item must be greater than the phase number of the receiving item. Note An item is controlled by central multisite planning if the Central Multi Site Planning check box in the Items - Planning (cprpd1100m000) session has been selected. Moreover, there must be a central multisite scenario that includes the sites involved. If you use the Compute Phase Numbers (cprpd6200m000) session to recompute phase numbers for central multisite planning, you need to specify the multisite scenario involved. Computation procedure The computation of the phase numbers is an iterative process. You can choose between two methods: Regenerative computation Net-change computation In a regenerative computation, every plan item initially gets phase number 0. ERP LN then checks the plan items one by one and adjusts their phase numbers until the criteria for phase numbers are fully met. For information on the net-change computation see Net-change phase number computation. You can see the result of the computation in the Order Phase Number field in the Items - Planning (cprpd1100m000) session. Note The phase number computation also checks for cycles in the bills of materials. Related topics Planning sequence and phase numbers To recompute phase numbers Net-change phase number computation To compute phase numbers for master-based planning |