Our product there's a lot of parts in the assemblies, and the most of it it's a comercial parts, which we need include like a external link:

And, inside of this link there's a big number of another pieces, in this case, when we do a drawing from a master assemblie to take a BOM, this BOM only show the partes inside of the master assemblie, not the pieces inside the assemblies inside of the master.
Situation which given to us a lot of work, we have had to make a sum of all the equal pieces in the other assemblies to take a final BOM with all de partes.
In general, would be really good if we had a option to show a part list from all the parts referente each design.