BOM Components - Demand not Showing

A straightforward answer for this I’m sure, This is the problem.

Sales Ordered entered onto the System for a Component (which has a BOM). On the item card for that component, it is showing Quantity on Sales Order (OK).

As the replenishment is Prod Order, a Production order is then raised to Manufacture x 10 off.

Component consists of 5 different parts (under top level).

Following firm prod order release, on top level item card - showing is 10 on Sales Order (due out) 10 on Prod order (Due in). But, for the components which makes up this item, no demand is showing.

Am I missing something entirely? (We are on Navision 5)