| # RRP run, item selection This section describes how ERP LN selects the items to plan in the Generate Order Planning (cprrp1210m000) session and the Generate Order Planning (Item) (cprrp1220m000) session. Net-change planning For each plan item, ERP LN records if a change has occurred since the last simulation, for example, a change in the bill of material or changed demand figures. ERP LN also records the earliest date on which a change has occurred ( net change date). You can have the order-planning sessions to plan only the items for which planning data changed since the last planning run. Bottom-up item selection To investigate the effects of a change in availability of some critical component that is used in many end products, you can use the bottom-up item-selection feature. In a bottom-up planning run, the ERP LN plans every item that somehow relies on the availability of the originally selected plan item. Top-down item selection To perform a complete planning run for some high-priority sales order, for example, for a sophisticated customized (engineer-to-order) end item, you can use the top-down item-selection feature. In a top-down planning run, ERP LN plans every purchased item and subassembly of which the timely availability can influence the production of the originally selected plan item. Restrictions ERP LN applies the following restrictions to the selection of plan items, for which ERP LN generates the order planning: ERP LN only includes plan items that you defined on the specified plan level. Bottom-up item selection does not work for items with a standard-to-order (STO) structure. Both top-down and bottom-up select the related items on one site. The selection algorithm stops as soon as it encounters a site change. Selection procedure ERP LN determines the set of plan items to plan in the following way: Selection range ERP LN selects the plan item you specified in the Generate Order Planning (Item) (cprrp1220m000) session or the range of plan items you specified in the Generate Order Planning (cprrp1210m000) session. Bottom-up selection If you select the Use Bottom-Up Item Selection check box, for the selected plan items, ERP LN also includes the following items: Parent items on the bill of material (BOM). Receiving items specified in the Supplying Relationships (cprpd7130m000) session. Parent items on the generic bill of material (BOM) for the generic items included in the item range. Derived items: The project items for which you created a project in the Project Control module in Manufacturing. Alternatives The use-up materials and alternative materials of the selected items. All items for which a selected item is a use-up material or alternative material. The bottom-up selection works in a multilevel way. For example, ERP LN also selects the parent item of the parent item, up to the end items that can be sold to customers. Top-down selection If you select the Use Top-Down Item Selection check box, for the selected plan items, ERP LN also includes the following items: Components on the bill of material. Supplying items that you specified in the Supplying Relationships (cprpd7130m000) session. Components on the generic bill of material (BOM), for the generic items included in the item range. Derived-from items: The generic or normal items that you use to create project items in the Project Control (PCS) module of Manufacturing, and from which the project items included in the specified item range are derived. If, during the order-based planning, the project structure of a project item must be built up, this also works together with the top-down item selection algorithm. For example, if during order-based planning, ERP LN finds out that supply must be generated for project item PX, ERP LN copies the structure of item X. In that case, ERP LN must also create new project items. These newly created project items are also taken into account during the planning. Alternatives The use-up materials and alternative materials of the selected items. All items for which a selected item is a use-up material or alternative material. The top-down selection works in a multilevel way. For example, ERP LN also selects the components of the components, up to the purchased parts. Restrictions ERP LN applies the restrictions listed previously under "Restrictions" to the plan item selection. If you selected the Run a Net Change Planning check box, ERP LN restricts the planning run to plan items of which the planning parameters, or item structure has changed since the previous order-planning run. For details, refer to Net-change simulations. Phantom items If the Inherit Warehouse if Parent Item is a Phantom check box in the Bill of Material (tibom1110m000) session is selected for any of the selected plan items, Enterprise Planning selects plan items for all clusters for the material. For more information, refer to Direct material supply (DMS) For examples of this procedure, refer to Item selection in order planning, examples. Related topics RRP run, an overview Item selection in order planning, examples RRP run, basic calculation for one item Net-change simulations Use-up materials and alternative materials in Enterprise Planning |