SAP系统生产计划控制课程.ppt

* * * * The customer 需求 consumes the 计划 in非独立需求uirement 数量 that lies either directly before it or directly after it. If the 计划 in非独立需求uirement 数量 that lies directly before the customer 需求s does not cover the customer’s 需求, then the system looks for the next closest 计划 in非独立需求uirements either in the future or the past. During this process, the system refers to the consumption periods maintained in the material master or in Customizing for Demand Management (see above). The consumption periods determine the intervals (for backward or forward consumption) within which customer 需求s consume 计划 in非独立需求uirements. Customer 需求s which lie outside the consumption period are not consumed. * * In MPS, the master 排程 items are 计划, that is, the planning run is carried out at critical part level only. 非独立需求uirements are 创建d for the BOM level directly below the planning level. Levels below this, however, are not 计划. This means that you can authorize any changes to the master plan before they affect the various BOM levels. This procedure ensures that planning remains consistent and transparent. The results of the planning run are not passed on to dependent parts until the master plan for the critial parts has been processed and finely tuned. This planning run can be carried out both as total planning and as single-item planning. In a second step, it is possible to start material 需求s planning for all BOM levels from MPS. * * * * You can protect the master plan from any automatic changes to master 排程 items in the near future by using a planning time fence. During the planning run, the system makes no automatic changes to 订单 proposals within the planning time fence (which is specifically determined for every master 排程 item). The system always dynamically 计算s the end 日期 of the planning time fence starting from the planning 日期. * You specify how the system is to determine the lot size by 选择ing one of the lot-sizing procedures in the material master record. The system uses the result of