Alternate Components in MRP
General
Alternate components represent parts that can replace the main part that
is registered in various types of product structures. These alternates can be
valid for specific structure types, specific time intervals, and defined
parent parts only. When executing a shop order the main component can be replaced
by valid alternates. Also, in MRP valid alternates can be considered.
Control Parameters for Alternate Components in MRP
Control parameters determine the conditions for using alternates in MRP:
In the Perform Site MRP dialog
- Plan Alternate Component
Controls whether the MRP
run should consider alternate components at all.
On Alternate Component page
- Valid Structure Types
Defines for which types of
orders or structures an alternate can be used. Options are All,
Remanufacturing , Remanufacturing and Repair.
- MRP Netting Use
Controls if the specific alternate
component is included in MRP calculations and if so, it defines if the use
of the main component or the alternate component should be prioritized.
Options are Exclude During MRP, Consume before
Main Component, and Consume after Main Component.
- Effective From
Controls the date interval for when
the alternate component is valid.
- Effective To
Controls the date interval for when
the alternate component ceases to be valid.
- Substitution Sequence
If there is more than one
registered alternate for one main component this parameter controls the
priority order for the valid alternates. A low number has a higher priority.
- Parent Part
Controls for which parent part an alternate component is valid. If
* is entered it is valid for all parents.
Alternate Component Logic in MRP
If the Plan Alternate Component is selected when ordering
an MRP, the logic for using alternate components kick in. Otherwise, MRP will
only consider the main component in each structure and order.
For each component demand, MRP will find all possible replacement alternates
according to the control parameters described above. Depending on the
MRP Netting
Use setting the logic for replacement will be different.
If MRP Netting Use = Consume after the main component,
the substitution sequence will be according to the following:
- Available stock on hand for the main component will be used.
- Existing non-pegged open supplies (e.g. Purchase Orders or Shop Orders)
for the main component will be used, no matter the planned receipt date. MRP
will suggest these orders to be moved to meet the required dates.
- Available stock on hand for the alternate component.
- Existing non-pegged open supplies (e.g. Purchase Orders or Shop Orders)
for the alternate component. These will only be used if the planned receipt
date is the same or earlier than the demand date. MRP will not suggest moving
existing orders for alternate components.
- Create order proposals (Purchase or Manufacturing) for the main component.
If MRP Netting Use = Consume before the main component,
the substitution sequence will be according to the following:
- Available stock on hand for the alternate component will be used.
- Existing non-pegged open supplies (e.g. Purchase Orders or Shop Orders)
for the alternate component will be used, if the planned receipt date is the
same or earlier than the demand date.
- Available stock on hand for the main component.
- Existing non-pegged open supplies (e.g. Purchase Orders or Shop Orders)
for the main component. MRP will suggest these orders to be moved to meet
the required dates
- Create order proposals (Purchase or Manufacturing) for the main component.
Note that MRP never creates any new supplies for the alternates based on net requirements for the main component.