Open the 
BOM Structure window.
Shows which child items are used in an item’s assembly BOM or production BOM. Each item level can be collapsed or expanded to obtain an overview or detailed view.
For assembly BOMs, any involved resources are listed under the items in the BOM.
For production BOMs, any involved machine or work centers are listed under the items in the BOM.
If the Warning field contains Yes, then an issue exists for the BOM line, which you can read by choosing the field.
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