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Hi,
usually while MRP run the system considers only first production version,
i.e only one BOM.
you can do the following,
1. Include 3 raw materials in the first production BOM and create 3 more
alternative BOM for each of the raw materials.
2. Create production versions accordingly. First BOM (which includes 3 raw
materials) should be included in the first production version.
3. In MRP4 view of the header material, keep 2 (selection by production
version) in selection method.
4. Run MRP. System by default will take the first production version (i.e.
the BOM with 3 raw materials).
5. Go to MD04. System will generate the stock requirements list for all the
3 components.
6. Analyze the same and choose the right production version in the planned
order of the header material.
7. You can delete the planned orders or purchase requisition of the other
components if you want, since you are going to
use only one raw material.
Hope this will solve your problem. Let me know if it works.

On Fri, Jun 19, 2009 at 3:36 AM, Sherry_Wheeler via sap-log-pp <
sap-log-pp@groups.ittoolbox.com> wrote:
>
>
> Hello PP Experts - we have a situation where we have three suppliers who
> provide the same raw material for a single assembly. Each of those raw
> materials has a unique material master number, lead time, and price. We have
> developed a BOM for this assembly with 2 alternatives based on those three
> raw materials, and as required, have flagged only one as the 'production'
> BOM; however, we want the system to consider the combined stock of all three
> possible materials before it would propose a replenishment of the material
> in the 'production BOM'. How can this be accomplished? __.____._