如果你是采购件的话fixed lead time 留空，3个processing lead time 可以设置，如果没有lead time的需求可以为空。
针对lz的问题，如果item 不多可以认为地去修改po 的need by date；如果很多item 都是这个问题，针对有问题的item相关的需求恐怕需要重新跑一次mrp了。

Calculating the Leadtime of Purchased Items.  

        1)  Your workday calendar IS included when calculating any lead-
            times for purchased items.

        2)  The purchased items leadtime is calculated as follows:

                Postprocessing Leadtime (time needed to move from receiving
                                          to inventory)
                   +
                Processing Leadtime (time vendor needs the order before
                                      delivery to your dock)
                   +
                Preprocessing Leadtime (purchase order preparation)

        3)  The results are:

                The dock date (found on the Planning Detail Report) is the date
                by which the vendor should deliver the material to your dock.

                    Dock Date = Order Due Date - Postprocessing Leadtime

                The start date is the date by which you should give the sales
                order to your vendor.
  
                    Start Date = Dock Date - Processing Leadtime

                The order date is the date by which you should start your
                purchase order.

                    Order Date = Start Date - Preprocessing Leadtime

        4)  You can assign values for fixed leadtime instead of assigning
            the processing leadtime.

看着这么多E文就头疼

看了你们的回复,我的问题还未解决,二楼说的设置已测试过不行,三楼说的实现不了.

会不会是系统问题?