Stock Check Sheet for Purchasing

Hi. I have inputted all of our parts inventory and bill of materials into Front Accounting and expected that I would easily extract which parts I need to order to replenish parts but it seems that both sales orders and work orders are not properly propagating through the bill of materials. For example,

Product A's bill of materials:
  item B, qty 1
  item C, qty 2
  item D, qty 3

Product A, has quantity on hand of 5, demand of 8, therefore availability is -3.

Front Accounting shows that Item B has quantity on hand of 16, demand of 8, therefore availability of 8.

Shouldn't it show that Item B has demand of 3 because there are already 5 Product A's on hand?

If not, how can I show this? Because it would be convenient to see how many of item B, C and D we would need to purchase (based on what is in stock) to create 50 Product As.

Thank you.