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Material Requirements Planning: Alternative
Items/Substitute Parts
Description
With release 3.0, you can define alternative items in the BOM. That is, you
can define a group of materials that can be used alternatively. This is
possible, if it is not important which of the materials is used - they can all
be replaced by each other. Or if a group of substitute materials exists for a
particular material and this information is to be saved in the BOM.
Steps to take
In the BOM that materials that are alternative items are grouped
together.
There are two possibilitites for doing this:
1. The alternative items should be planned
with specific usage probabilities. For this purpose, the usage probabilities
of the individual alternative items are entered in the BOM.
In the planning run, the dependent requirements are corrected using the
information from the usage probabilities.
Example:
Alternative item 1 Usage probability 60
Alternative item 2 Usage probability 30
Alternative item 3 Usage probability 10
The dependent requirements are for 100
pieces.
In this instance, 60 pieces of alternative 1 are required, 30 pieces of
alternative 2 and 10 piecese of alternative 3.
2. The information that certain alternative
items exist that can be used is saved for one material so that the system
knows how to react if a missung parts situation occurs.
This material receives a usage probability of
100. The alternative items receive a usage probability of 0.
Thus, in the planning run the system created no dependent requirements for the
alternative items. However, if a missing parts situation occurs for the main
material, the employee responsible has information available on what parts can
be used instead.
Various strategies can be predefined for the withdrawal posting of
alternative items for the reservaqtion of the production order:
- withdrawal according to availability of the alternatives
- withdrawal according to usage probability
- withdrawal only for 100% availability of the alternative, that is, an
alternative can only be withdrawn if it covers 100% of the requirement - the
requirement cannot be split among various alternatives.