PIR的Consumption和Reduction.doc

基本概念：PIR（Planned Independent Requirement）的Consumpiton（消耗）和Reduction（減小）是什麼。前者是MD04中的視覺效果，是動態變化的；後者則是真真正正減小了PIR，增加了提取數量。 The consumption reduces planned independent requirements dynamically, whereas the reduction physically reduces the planning quantity and increases the withdrawal quantity accordingly.SAP Note: 7728561. Question:What is the difference between planned independent requirement consumption and planned independent requirement reduction ?Answer:The consumption reduces planned independent requirements dynamically, whereas the reduction physically reduces the planning quantity and increases the withdrawal quantity accordingly.For example: You create a planned independent requirement with 100 pieces. This planned independent requirement is consumed against a sales order with 10 pieces. The planning quantity and withdrawal quantity remain the same (see MD63) but the planned independent requirement is displayed in the stock/requirements list (MD04) with the quantity 90. The independent requirements reduction occurs when you post the goods movement, in this case, with the goods issue for the sales order. The planning quantity of the planned independent requirement is reduced to 90 pieces and the withdrawal quantity is increased from 0 to 10 (see MD63). In the stock/requirements list, the planned independent requirement is still displayed with 90 pieces despite the reduced planning quantity because when you post the goods issue, the customer requirement against which the planned independent requirements had been consumed also disappears.2. Question:Which consumption parameters (Consumption mode/consumption period) are taken into account?Answer:The parameters maintained in the material master (material requirements planning view 3) have the highest priority. If you do not specify a consumption mode, the system uses the consumption parameters from the MRP group that is assigned to the material. If a consumption mode is not specified there, the consumption mode is set to 1 by default (backward consumption only) with a (backward) consumption period of 999 days. This means that the consumption cannot be deactivated because the consumption parameters have not been maintained. The consumption periods are calculated in workdays.3. Question:Where can I check whether a planned independent requirement is consumed or against which requirements it is consumed?Answer:a) In the total requirements display (MD73), you can display details about which assignment requirements (customer requirements, dependent requirements, reservations, calls for stock transfers) are used to consume a planned independent requirement.b) In the stock/requirements list (MD04) or the MRP list (MD05), planned independent requirements are displayed with their planning quantity minus the consumed quantities. Planned independent requirements that have been completely consumed are not displayed.c) In the planned independent requirements maintenance (MD61, MD62, MD63), you can display the consumed quantities on the Schedule lines tab page (Menu path Settings - Consumed quantity).4. Question:Why is a change to the strategy group or a consumption-relevant change in Customizing ineffective?Answer:When you create a new planned independent requirements item, Customizing data is stored in the corresponding database table (PBIM or PBID) and not adjusted later. When you delete and recreate a planned independent requirements item in Transaction MD62, the changed Customizing data is not taken into account either because the existing data record receives only a deletion indicator and is then reactivated. To physically delete the data record, you must completely reorganize an existing planned independent requirements item (Transactions MD74, MD75, MD76). With the new entry, a new data record is created with the current Customizing settings (see Note 166267).Changes to the consumption mode and consumption periods are immediately effective.5. Question:Which settings are required to consume calls for stock transfers with planned independent requirements?Answer:a) For the consumption of a planned independent requirement with final assembly, the Mixed MRP indicator must be set to 1 in the material master. The consumption indicator of the planned independent requirement must be set to 3 (see the Item tab page in Transaction MD63). When you create a planned independent requirement, the system uses the default value from Customizing Transaction OMP6.b) For the consumption of a planned independent requirement without final assembly, the Mixed MRP indicator must be set to 3 in the material master. The consumption indicator of the planned independent requirement must be set to 3 (see the Item tab page in Transaction MD63). When you create a planned independent requirement, the system uses the default value from Customizing Transaction OMP6.c) A consumption with planned independent requirements of a planning material is not possible.6. Question:How I can flexibly define against which MRP elements planned independent requirements are consumed?Answer:Use Planning consumption indicator on the item view of the planned independent requirements maintenance (MD61, MD62, MD63) to determine whether a planned independent requirement is consumed against customer requirements, reservations, dependent requirements and calls for stock transfers. The MD_PIR_FLEX_CONS BAdI, which allows a more detailed differentiation based on the MRP elements, has been implemented for Release 4.7. In previous releases, you can implement this BAdI using modification Note 127370.7. Question:The availability check against planned independent requirement returns an unexpected result. What has to be checked?Answer:Note 622299 describes the general procedure and also frequently asked questions.8. Question:Why are monthly or weekly requirements not consumed even though the assignment requirement is in the same period?Answer:Planned independent requirements that are created as monthly requirements or weekly requirements are internally set to the first workday of the period. This is the requirements date in the stock/requirements list and the relevant date for the consumption.For example: In the material master, a 10 days backward consumption is defined. A monthly requirement for JAN/2005 is created. The first workday of the month is JAN/03/2005. A customer requirement with the requirements date JAN/20/2005 is not consumed because there are more than 10 workdays between the customer requirement and the planned independent requirement. For consumption and reduction, it does not make any difference whether the planned independent requirement was created as the JAN/2005 monthly requirement or as the JAN/03/2005 daily requirement.9. Question:I am using several active planned independent requirement items. Can I control the order in which they are consumed?Answer:No. Schedule lines for planned independent requirements items with the same consumption-relevant settings, which only differ in Version or Requirement plan number for example, are both used for consumption and reduction at the same time.10. Question:Why is a planned independent requirement not consumed against a customer requirement even though it is in the consumption period?Answer:It is a prerequisite that the Consumption indicator of the planned independent requirement (ZUVKZ) corresponds to the Assignment indicator of the customer requirement (VPZUO) and provides the consumption (values 1, 2 or 3). You can check these values by calling the detailed dialog box for the corresponding MRP element in the stock/requirements list. The field is not displayed for customer requirements that do not provide any consumption (VPZUO = ). The values are copied to the corresponding database tables (PBIM/ PBID, VBBE/VBBS) when you create the planned independent requirements item or the customer requirement and they are not adjusted if the planning strategy or Customizing settings are changed (see question 4)You must also ensure that the Planning consumption indicator (VERVP) provides a consumption with customer requirements. You can display this on the detail dialog box for the planned independent requirements in the stock/requirements list (MD04) or in the item view of the independent requirements maintenance (MD61, MD62, MD63). Any changes to this indicator affect the consumption immediately.11. Question:What should I do if customer requirements are not consumed because they are not transferred to the material requirements planning or they have an incorrect assignment indicator?Answer:The settings of the requirements class that is found (Transaction OVZG) control the transfer of requirements to the material requirements planning. If customer requirements are not create as you want them to be, refer to point 7 of Note 547277 and also to Note 207942. These notes describe how the requirements class is determined.12. Question:Why are planned independent requirements not consumed against requirements in storage locations that are planned separately or that are excluded from the material requirements planning?Answer:See Note 545327.13. Question:Can I ensure that customer requirements are consumed only with planned independent requirements if the respective requirements types are linked by the strategy (Transaction OPPS)?Answer:No. The consumption indicator and the assignment indicator th