MRP运算过程替代关系逻辑

[tr] [td=90]BOM [td=86]
[td=59] [td=110] [td=106] [td=140] [td=66]
[tr] [td]预测单： [td]物料编码 [td]数量 [td]预测开始日期 [td] [td] [td]
[tr] [td] [td]ANB301 [td]26400 [td]2015/12/27 [td] [td] [td]
[tr] [td] [td]ANB301 [td]22500 [td]2016/1/3 [td] [td] [td]
[tr] [td] [td]ANB301 [td]22500 [td]2016/1/10 [td] [td] [td]
[tr] [td] [td]ANB301 [td]22500 [td]2016/1/17 [td] [td] [td]
[tr] [td] [td]ANB301 [td]22500 [td]2016/1/24 [td] [td] [td]
[tr] [td] [td]ANB301 [td]16800 [td]2016/1/31 [td] [td] [td]
[tr] [td] [td]ANB301 [td]13440 [td]2016/2/14 [td] [td] [td]
[tr] [td] [td]ANB301 [td]20160 [td]2016/2/21 [td] [td] [td]
[tr] [td] [td]ANB301 [td]20880 [td]2016/2/28 [td] [td] [td]
[tr] [td] [td]ANB301 [td]20880 [td]2016/3/6 [td] [td] [td]
[tr] [td] [td]ANB301 [td]20880 [td]2016/3/13 [td] [td] [td]
[tr] [td] [td]ANB301 [td]20880 [td]2016/3/20 [td] [td] [td]
[tr] [td] [td]ANB301 [td]20880 [td]2016/3/27 [td] [td] [td]
[tr] [td]BOM [td] [td] [td] [td] [td] [td]
[tr] [td]产品： [td]ANB301 [td] [td] [td] [td] [td]
[tr] [td] [td] [td] [td] [td] [td] [td]
[tr] [td]材料： [td]物料代码 [td]分子 [td]分母 [td]变动损耗率 [td]固定提前期（天） [td]批量
[tr] [td] [td]B1200008 [td]1 [td]1 [td]1.5 [td]42 [td]0
[tr] [td] [td]B1500001 [td]1271 [td]1000 [td]5 [td]28 [td]500
[tr] [td] [td]B0700002 [td]19 [td]100000 [td]89.9 [td]14 [td]100
[tr] [td] [td]B0600014 [td]58 [td]10000 [td]66.59 [td]56 [td]15
[tr] [td] [td] [td] [td] [td] [td] [td]
[tr] [td=7,1]运算结果中，替代件的逻辑是怎样的，为什么在2016-02-14产生替代？整体替代的逻辑关系请详细说明下
[tr] [td] [td] [td] [td] [td] [td] [td]
[tr] [td]版本：5.0 [td] [td] [td] [td] [td] [td]
[tr] [td=2,1]补丁：2015-11-26 [td] [td] [td] [td] [td]
[tr] [td=5,1]联系人： 方主仕 QQ:285544628 电话：13929608342 [td] [td]