* 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
   BPCS/400 Computer Janitor ... see

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