Zero and negative quantity on BOM structure

Hi Team,

We have various BOM/item structure combinations between parent and child items such as FG under FG, FG under Kit, Kit under Kit, Option Class under Model, FG under Model, and so on. I wanted to know for which such combination of item type, negative and zero quantities for child components are allowed on BOM. Is there any supporting document from Oracle which can clarify when negative and zero quantities are allowed and how this impacts on transactions such as sales order.

Regards,

Gaurav