Allocated shows you the items on orders that allocate the item you are viewing.
Allocated for BikeSpoke shows one order for Bike which Allocates 24 BikeSpoke, then a PO which adds 44, then an order for Bike2 which also uses 24 spokes.
This feature is enable by MRP Add-on and per-employee by clicking Show Allocated By Warehouse on the Controls tab of the Employee card. (7546)