Hi @jamiewhite 

In manufacturing lead time it is the time taken to manufacture the part where as in purchasing lead time, it is the time taken to purchase the part in to inventory.

Expected lead time is the time taken for the part to be in the inventory which could be manufactured or purchased.

The lead time calculation can be done manually or as a background job to update the field on a regular basis. However, both Manufacturing and Purchase lead times must also be calculated in real time or as a background job in order to do so.

Regards,

Dasuni

@Dasuni Samarakoon 

thanks for the response but can you explain by what is meant by ‘ time taken for the part to be in the inventory’ ?

regards

Jamie 

@jamiewhite the value in Expected Lead Time includes acquisition lead time as well as manufacturing lead time. For example, let's say that you manufacture a part consisting of several components and one of the components is not in inventory and must be ordered. In this example, the manufacturing lead time of the part is incorrect because it assumes that all parts are available from inventory. Thus, you should use the Expected Lead Time field to help ensure that a part can be delivered in time, even when not all components are in stock.

So the Expected Lead Time could be higher than manufacturing lead time. It can also be calculated using the lead time calculations Calculate Purchase Lead Time found in IFS/Purchasing, and Cumulative Lead Time Calculation, Lead Time Calculation, and  Change Cumulative Lead Time  found in IFS/Manufacturing Standards.