Cost Rollup to consider which structure type of Phantom in case of multiple structure types

Summary:

Cost Rollup to consider which structure type of Phantom in case of multiple structure types

If there are different case scenarios

Parent has Phantom as component in the WD with Supply Type = Phantom

and then Phantom has below cases

    1.  Phantom has only one structure Type = Primary  

    2.  Phantom has  multiple  structure Types = Primary , ALT1, ALT2 etc. created in this order

     3.  Phantom has only multiple  structure Types except Primary =  ALT1, ALT2 etc.

created in this order

    4. Phantom has only non-primary structure type = ALT1  

Parent Rollup will consider BoM Explosion of which structure type?

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