Scenario: Create a saved search to display items having the backorder quantity is lower than what is on order
Step: 1 Create an Item saved search
List> searches> saved searches> New> Item
Provide necessary criteria and results.
In the criteria add the formula numeric field
Add formula: NVL({quantityonorder},0)-NVL({quantitybackordered},0)
And greater than needs to be defined.

Save and Run.