For SAP PP module, the plan is at its core. If you can master the group policy and related applications, it can be regarded as a quasi-expert PP module. In this article, I will give you analytical about Group Policy features and application process Note Links 10.
First, the group policy processes sketch 10
These are the strategies adopted plan of 10 business processes sketch. This sketch can be seen from at least two points. When production-to-stock, is often the source of demand, "independent demand." In the SAP system, it is through the MD61, according to the supply situation of enterprises and production market, weekly or monthly increments establish production plans. Then, after the sales order shipment will be deducted independent requirements based on the number of shipments. Visible, independent demand is the head of Group Policy 10, and the order is shipped tail group policy 10.
Second, the application of the various aspects of Group Policy Precautions
1, the basic data
As we all know, SAP system different plan models , are achieved through the use of cooperation between the parameters. Its background application is only one. To do this accurately establish the underlying data is especially important. To properly demonstrate the effect of Group Policy 10, requires the following basic data. Are material data (which requires the establishment of sales of finished data view, the work plan views, etc.), BOM data, routing data.
It should be emphasized at the finished material master. You can see from the graph above, we need to wait until when the sales order shipment deductions independence requirements. In order to be able to establish sales orders and shipments, we need to create the finished product sales to view the data. In the MRP planning view, the group policy to select 10, while the integrated MRP parameters to be blank. Other relevant parameters default value.
2, independent requirements
For stock production, the demand for an independent source of demand. To this end user first needs based on the actual situation of enterprises to establish an independent demand by MD61. In establishing independent demand, pay attention to the following three aspects. First, the establishment of an independent needs are, to consider the capacity of enterprises. Under normal circumstances, it is based on actual production last year to fine-tune. The second is to consider the market demand. After all, planning is based on market demand. Third, we must consider the needs and planning cycle period. As you may demand a one-year period, weekly planning cycle and so on. The length of the period is mainly based on the ability to plan early. If the business plan is relatively stable, relatively strong ability to plan, the plan may be a little longer period. This can reduce the production and management costs. Instead, plan or demand changes frequently unstable, and the planning period will have to set relatively short.
It must be emphasized is that demand is independent of the source program, which is directly related to the plan enforceable. If you plan to lack of enforceability, it will lose the value of the program. Although the plan does not change quickly, but for production planning, in a certain period of time or plan should remain relatively stable.
3, run MRP calculation
After the completion of the establishment of independent requirements, MRP or MPS will be calculated based on independent demand. In this session, we need to consider several factors.
First, the number of stocks. Adopt planning strategy 10, which is used in the calculation of net demand mode . That is, the number of systems out of operation planned orders, and available stock will be deducted. If the number of independent demand 100PC, and available inventory 10PC, the planned order quantity is 90PC. Using different strategies planned, calculated their needs are different. Some planning strategy is used in a manner gross requirements, that does not consider the amount of available inventory. Users in practice, we need to pay attention to this small difference.
Second, the need to focus on the planned order can be converted to production orders. According to plan strategy planned orders generated by 10, can be converted for production and procurement to production orders or purchase orders. But some planning strategy (plan strategies such as virtual device), it is not planned order can be converted into production orders. Only under the order of the planned order to be able to convert into production orders or purchase requisitions.
4, transfer orders for production orders and warehousing
计划订单生成后，就可以根据计划订单来生成生产订单或者采购申请。在转换时，可以根据MD04进行单个转换，也可以根据CO41进行批量转换。采用什么样的方式进行转换，不是这篇文章中讨论的中间。这里笔者要强调的是，在生产订单下达或者生产订单完工入库之后，原先创建的独立需求的数量并没有扣减。这也是不同的策略类型的不同之处。即策略类型不同，其需求的扣减时间是不同的。
这个扣减时间非常重要。在实际项目中，这是用来选择组策略类型的核心因素之一。
5、 开立销售订单
这个步骤是开立销售订单。这个环节中，需要注意如下内容。
一是销售订单是否需要下达。可以根据后台设置来实现销售订单是否要下达后才能够安排生产计划。如果设置了需要下达，则要下达后才能够在MD04中显示，即该销售订单才会参加MRP运算。也就是说，如果开立了销售订单之后，没有在MD04中显示，则需要考虑一下，是否该销售订单需要下达。如果要下达的话，可以通过VA02进去，进行更改。在项目页签(双击项目行)中，可以看到计划行子页签。将计划行类别这个字段的值从CN改为CP即可。
二是开立销售订单及订单下达后，虽然在MD04中会显示，并参与MRP运算。但是该物料对应的独立需求并没有减少。换句话说，在采用组策略10的情况下，其独立需求重建的时间并不是销售订单下达之后。而应该是出货之后。
三时是组策略10是纯粹的按库存生产。按库存生产这种模式，其实还可以分为“纯粹的按库存生产”和“非纯粹的按库存生产”。纯粹的按库存生产是指销售订单的数量并不会影响到生产计划。如生产计划是100PC，销售订单是120PC，其生产计划仍然是100PC，不会变为120PC。在某些行业其生产计划就是如此安排的。如像农夫山泉这种企业，其生产计划是根据其产能和市场的需求来安排的。由于其市场供给量基本稳定，为此其生产计划不会受到外围销售订单的影响。但是某些企业，则不是。其生产计划是被销售订单牵着鼻子走的。对于某些客户来说，可能需要安排紧急插单等。对于这种企业，采用组策略10就不是很合理。
6、 销售订单出货
销售订单出货是组策略10的最后一个环节。只有销售订单出货后，独立需求才会真正被扣减。换句话说，可能存在这种情况。独立需求上显示的数量有很多，但是可能绝大部分的数量都是有销售订单的。为此在采用组策略10的情况下，在使用MD04等工具查看成品物料需求时，往往要结合订单预留来查看，才能够得到准确的结果。
综上所述，对于组策略10来说，有如下几个核心的特点。分别是计划订单数量采用的是净需求(需求计算时会考虑可用库存)、是纯粹的按库存生产(其生产计划很少受到外围销售订单的影响)、独立需求的扣减时机是销售订单出货(在分析成品物料需求时要结合订单预留)。通常情况下，这种组策略往往应用在“市场占有率比较高”、“产品高度的标准化”、“产品生产高度的自动化”等企业，如可口可乐或者农夫山泉等企业。这些企业有一个共同的特点，即他们的生产计划都是以年为单位进行安排的，很少受到外围的影响。即使有外围的影响，但是由于产能的限制，也很难对生产计划作出调整。