@Rachael Hinckley Lead time calculation considers the distribution calendar to come extent. Please check if this post helps you?
Hello,
The Order Cover Time should be defined in manufacturing calendar days. When it comes to internal processing MRP is working with the manufacturing calendar. You could argue that for purchased parts it should use the distribution calendar when adding the order cover time. That could be a possible future enhancement.
So if you have a order cover time of 10, MRP will summarize the demands during 10 manufacturing calendar days and create a PO/SO Req that covers the summarized demand.
Regarding your third question… I am not 100% sure what you are asking for, but could Safety Lead Time be something for you to look into. It gives some extra time window, so that we are receiving material a few days earlier than the required date.
Cheers
-Mats
Could you use Picking Lead Time (Site) or Internal/External Transport Times (Supply Chain Matrix for Site) to build in extra days to the Lead Time ie get the Purchase reqs to have an earlier “Latest Order Date”?