ATP与RLT

1，ATP(Avaliable To Promise)
ATP实际上代表一个产品的预计可用数量，就是说，在未来的某一个时刻某一个产成品可以提供给客户的数量，
2，RLT
RLT（Replenishment Lead Time）的概念，叫补货提前期
RLT会影响ATP的结果。
RLT有对于in-house production和external procurement两种产品的定义不同：
对于In-house production又有两种不同的计算方法

The following options exist for materials produced in-house if the replenishment lead time is included in the availability check:

The Total replenishment lead time field is maintained.（物料主数据MRP3 视图）
In this case, the time maintained in this field is used for the availability check.
The Total replenishment lead time field is not maintained.
In this case, the system reads the in-house production time and, if available, the goods receipt processing time, and interprets the total of these two times as the replenishment lead time for the availability check.
in-house prodn. time+GR processing time in MRP2 view

 

The TRLT is not necessary for materials procured externally. In external procurement, the system adds the processing time from purchasing, the planned delivery tme, and the goods receipt processing, and uses this total as the RLT for an availability check with RLT.

以下图说明了RLT对ATP的影响

n    You can take into account all inward and outward movements. It is recommended, however, that you only implement an availability check at the end of the replenishment lead time.<o:p></o:p>

n    The replenishment lead time can be specified for each material.For example, trading goods: planned delivery time + processing time for goods receipt,
         Finished goods: in-house production time<o:p></o:p>

n    The system assumes that the material will be available at the end of the replenishment lead time by the latest.<o:p></o:p>

n    The availability check is only run until the end of the replenishment lead time.<o:p></o:p>

n    If you check availability in case 4 without including replenishment lead time, the result is the same as for case 2. The customer requires a complete delivery. You cannot make 20 units available until the same date on which the last purchase order for 60 units arrives (inward movement).<o:p></o:p>

n    However, if the system checks availability using the replenishment lead time, you can make 20 units available for the date on which the purchase order with 50 units arrives (inward movement). Only the inward and outward movements that take place within the replenishment lead time are included in this check. <o:p></o:p>

关于ATP与RTL的配置
https://www.sdn.sap.com/irj/sdn/thread?messageID=4309121
http://sapfunctional.com/SD/AvailabilityCheckConfiguration.htm