order promising doesn't consider alternative item structure for assembly items

Summary:

We have a product with 2 structures, each structure includes one component, but oracle planning bill of resource dosen't collect all of them

and order promising cannot consider the alternatives

We've got onhand inventory for one component MR2，but planning collected data of MR1，MR2 is not considered in order promising

how will order promising work if an item has more than one structure？

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