The Rhombus Factory Information System stores the bill of materials required to make a part against the operation where the parts are required. This is in contrast to other systems which store the bill of materials against the part itself.
As a consequence the FIS planning tools know exactly when each material for a works order is required. They don't need to have all materials available to start a works order if they know that some components are not needed until a later operation, which may be a number of days away, particularly if the parts go to a sub-contractor during the manufacturing process.