MFG/PRO 9.0 User Guide Volume 3: Manufacturing - QAD.com

250 MFG/PRO USER GUIDE — MANUFACTURING
Ï See Chapter 5,
“Co-products/
By-products,” for
more details.
MRP Processing for Co-products and Base Processes
MRP plans co-products and base processes differently than other items.
Net requirements for co-products are passed down to their respective base
process items. MRP then generates planned orders for base process items
to meet these requirements. These planned orders are imploded, creating
planned orders for each of the co-products and by-products.
MRP Processing for Routable Assemblies
For routable assemblies, MRP generates a separate routable work order
when an order for the parent item is released. Usually, you should not
approve these orders or change their status to firm planned.
MRP Scheduling
When MRP runs, it compares each item’s demand with existing supply
orders for each period. It automatically reschedules planned orders to
reflect changes in the plan and generates an action message for each
rescheduled order. Some orders MRP cannot change because they are
firm planned or within the time fence specified in the item planning data.
For these, it generates action messages suggesting that these orders be
rescheduled to balance supply with demand.
When MRP reschedules planned orders for higher-level end items, lowerlevel
components dependent on the rescheduled demand remain
associated with the original supply order date. They are not automatically
rescheduled based on where action messages say parent orders should be
moved. To adjust for this:
1 Run Selective MRP for master scheduled items and review and
handle action messages.
2 Run Selective MRP again at this level to ensure that all action
messages have been dealt with.
3 Then, run Regenerative or Net Change MRP for all dependent
demand items.