| # CTP reservations To prevent the user from promising the same components or capacities multiple times, LN can make CTP reservations. This step is required because, when you save a sales order, only a planned issue exists for the end item, and not for the components and capacities. Therefore, at that moment, the ATP of the component and the capacity is not yet decreased, although a part has already been promised. A planned issue for components is made only when you run the order-based planning engine. The sales order demand of the end item will be exploded through the bill of material, and the dependent demand on the components or required capacity is assigned to the selected work center. To overcome the time gap between sales order entry and running the order planning, CTP reservations will decrease the ATP of the components/capacities immediately when the order is entered. The same is valid for master-based planning. Only when the master-based planning engine is run, planned issues are made on components and capacities by exploding the BCM/BCC. Creating CTP reservations requires performance. For items with a master plan, the recalculation of ATP figures based on these reservations also requires performance. If you do not want to create CTP reservations, clear the Online ATP Update check box in the EP Parameters (cprpd0100m000) session. Note If the Online ATP Update check box is selected in the EP Parameters (cprpd0100m000) session, CTP reservations for components and capacities are made when you save the original demand to the planned inventory transactions, as shown in the Planned Inventory Transactions (whinp1500m000) session. The original demand can be a sales order, or a sales quotation that exceeds the success percentage. However, for manually entered JSC production orders, CTP reservations are also made for lower level materials. In that case, the JSC order creates the original demand. CTP reservations are created for the actual scenario only, not for simulation scenarios. |