# Cumulative lead time not including purchased material lead time

**Category:** [Epicor ERP 9](https://www.epiusers.help/c/e9/7)
**Created:** 2017-01-06 04:38 UTC
**Views:** 1301
**Replies:** 2
**URL:** https://www.epiusers.help/t/cumulative-lead-time-not-including-purchased-material-lead-time/36804

---

## Post #1 by @Matthew_Lawless

I have a manufactured part that contains a purchased material with a lead time of 60 days. When the lead time calculation is executed, it results in the manufacturing lead time of 30 days (receive time + mfg time). I have read the MRP tech. ref. and it shows in an example that purchase lead times should be included. I also have the correct settings checked for include in LT calc in plant setup. Has anyone had experience with this issue?

Regards

Matthew Lawless
Mackay Consolidated Industries.

---

## Post #2 by @Jim_Lutz

Do you have the Advanced Production Scheduling module? I don't know if that would affect this, but I do know that the Constrained Materials feature won't work without it, so MRP won't forward schedule considering material purchase times without it; maybe they're connected (as they should be).

---

## Post #3 by @randallweber

I don't understand how this field can be useful. It must calaculate the lead time to produce one part - right? How is that helpful?

---


**Canonical:** https://www.epiusers.help/t/cumulative-lead-time-not-including-purchased-material-lead-time/36804
**Original content:** https://www.epiusers.help/t/cumulative-lead-time-not-including-purchased-material-lead-time/36804