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If you regenerate MRP as often as you regenerate MPS, there should not be any problems. The requirements of the MRP items will be cought, and al the necessary orders will be planned to cover these requirements.

As a matter of fact., I dont see as much of a need today to spit items between MPS and MRP, given the speed computers can regenerate MRP. My understanding is, 20-30-40 years ago, because MRP took hours to run, there was a need to cut the MRP generation process into a smaller subset of capacity critical or order critical items, the MPS items , and the other non-critical items: the MRP items. Any toughts on this?

Daniel Warthold



----- Original Message ----- From: "Al Mac" <macwheel99@xxxxxxxxxxx>
To: "BPCS_L discussion" <bpcs-l@xxxxxxxxxxxx>
Sent: Friday, October 20, 2006 1:24 AM
Subject: [BPCS-L] Resell Purchased / Master Schedule ?


  * One rule of thumb says MRP140 needs to "M" Master Schedule End Items
  that we manufacture and sell for customers, so that MRP will calculate
  what's needed of all components to be manufactured or purchased.
  * Another rule of thumb says raw material that we purchase to be used as
  components of the manufactured parts, nor any sub-components, should not
  be "M" coded, just the end items that we sell the customers.
  * A dispute has come up with respect to what is the correct Master
  Schedule coding for items that are coded purchased, but can also be sent
  customers as THEIR service or repair parts?

It has been several years since we had MRP education, so different people
  memories stray into disagreements needing clarification.

I had thought that when the raw materials show up as components of master
  scheduled items, currently on customer orders, that MRP will correctly
  calculate how many we need thanks to both dependent and independent
requirements, but if a customer orders a supply of our raw materials, that
  are not currently needed due to being in the BOM of master scheduled
active items, then by not having these raw materials master scheduled, we
  have effectively told MRP to ignore these requirements, and that having
  extra items coded as master scheduled did no harm to MRP.

  We are on BPCS 405 CD mixed mode.
  We run MRP500 then MRP600 by facility, with a few extra runs of MRP500
  thanks to a prior thread on BPCS-L regarding parts complexity.
Our BOM has several levels. We used to be heavy into DRP resupply orders,
  but that part of our business is now about dad.

  -
  Al Macintyre
  http://en.wikipedia.org/wiki/User:AlMac
  http://www.ryze.com/go/Al9Mac
  BPCS/400 Computer Janitor ... see
  http://radio.weblogs.com/0107846/stories/2002/11/08/bpcsDocSources.html
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