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S4 HANA生产模块学习笔记-MRP计划流程 2

  • 2026-02-03 12:51:38
S4 HANA生产模块学习笔记-MRP计划流程 2

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2. 计算净需求

净需求计算可以被认为是 MRP 算法的核心。在净需求计算步骤中,MRP 将确定哪些确切日期会出现库存短缺,并且有必要创建新的补货提案,以确保服务水平不会受到影响。

在此步骤中,MRP 将检查工厂库存加上现有的企业补货要素是否可以满足要求。如果工厂库存加上特定日期的确认收据无法满足所需数量,则存在短缺。系统将不得不在将来重新安排现有的确定提案,或生成新的计划订单或采购申请来弥补这种短缺。 

当我们谈论需求时,我们谈论的是应该从库存中删除一定数量的计划元素。对于成品,常见需求是销售订单、交货或计划独立需求 (PIR)。对于半成品或原材料,需求通常是预留或从属需求。库存转移也可能代表供应工厂的要求。补货要素是将来应该为库存带来一定数量的要素,收货可能是确定收货(例如,生产订单或采购订单)或计划收货 (例如,计划订单或采购申请)。例如,当完成生产订单的执行时,通常会过帐一个收货,这将增加工厂中的可用库存。发生这种情况时,生产订单将不再与 MRP 相关,并且不会在净需求计算中考虑。

MRP 可以认为有不同类型的库存。除了始终被视为可用的非限制库存外,还可以在定制中定义 MRP 是否考虑冻结的库存、转移中的库存或可用的限制性库存。

根据所选的 MRP 程序,净需求计算逻辑可能略有不同。对于 MRP 程序,识别短缺的基本计算方法是库存加上现有收货减去需求和安全库存。如果此计算的结果为负数,则意味着将出现短缺,应触发补货。但是,在再订货点程序中,系统只需将库存添加到现有收货中,并将结果与再订货点进行比较。如果此总和低于再订货点,则意味着应触发补货。还可以更改再订货点的 MRP 类型设置,以将需求包含在计算中。在这种情况下,将添加库存和收据,减去需求,然后与再订货点进行比较。如果您将 MRP 程序中的净需求计算与再订货点程序中的净需求计算进行比较,则存在一个主要区别:当使用 MRP 程序时,系统将为我们出现短缺的每个期间触发新的补货提案,但如果我们使用再订货点程序, 当可用数量低于再订货点时,应仅触发一次补货。 

用于基于预测的程序的净需求计算的逻辑与 MRP 程序使用的逻辑类似,主要区别在于只有预测才会被视为需求。这意味着,只要预测需求大于库存加收货,就会触发补货。根据为物料选择的计划策略,净需求计算的结果也存在一些变化:

  • 使用 MTO 策略时,在净需求计算中不会考虑工厂库存,因为销售订单需求将被分配给特殊的单个库存段。 

  • 当使用总需求计划(一种 MTS 策略)时,工厂库存将根本不包含在净需求计算中,因为计划策略背后的想法是根据预测进行生产,无论已经有多少库存。

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  1. CONNECT:[ UseTime:0.000467s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000910s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000340s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001666s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000568s ]
  6. SELECT * FROM `set` [ RunTime:0.000217s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000834s ]
  8. SELECT * FROM `article` WHERE `id` = 464832 LIMIT 1 [ RunTime:0.000502s ]
  9. UPDATE `article` SET `lasttime` = 1770280749 WHERE `id` = 464832 [ RunTime:0.019173s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.001505s ]
  11. SELECT * FROM `article` WHERE `id` < 464832 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001374s ]
  12. SELECT * FROM `article` WHERE `id` > 464832 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002152s ]
  13. SELECT * FROM `article` WHERE `id` < 464832 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000731s ]
  14. SELECT * FROM `article` WHERE `id` < 464832 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.010747s ]
  15. SELECT * FROM `article` WHERE `id` < 464832 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.038293s ]
0.145926s