You might have enabled the Supply Allocation feature, created Allocation Strategies, set
Demand Preferences for Supply Allocation, however, the Allocated Supply column in
your transaction (e.g. Sales Order) is still 0 even if there are quantities On Order.
One possible reason why the Supply will not be allocated is failing to populate the
Location in your Purchase Order. When this is the case, edit the PO and set the
appropriate Location. Refresh the page and you should be able to see that the quantity
is allocated.
However, if the Location is already populated and the Allocated Supply is still at 0, the
Expected Receipt Date might not be visible on your Purchase Order form. When
this is the case, customize your PO form. Under Sublist Fields, make sure to mark the
Show checkbox, and Save.
After showing the Expected Receipt Date field, you must set the date in your PO to set
the Allocated Demand.
The Allocated Supply in your Sales Order should now be showing the correct quantity.
Remember that this feature is to efficiently match supply with demand, thus, details
for both supply and demand transactions should be checked.