Create List of Values (LOV) in Discoverer reports.

The Item classes in Discoverer are treated as List of Values (LOVs). A List of value can be created and referenced by several fields of the folder.
Following are the steps to create LOV in discoverer. In the example below I am creating LOV on US States.
1) Connect to Discoverer using Admin and select the business area where folder/LOV needs to be created.

2) Create a custom folder for US States using following query

 select * from ar_lookups
where lookup_type like 'STATE'

3) Select the field for which Item class is to be created and right click on that to select New Item Class. Click next on the wizard and finally click finish button to complete creation of Item class. In our example, the LOV is created on the lookup code field.

4) Now if any parameter is created based on Lookup Code column then the List of value will be attached to it.
5) This LOV can also be referenced by another column. For example there is another folder which has column Bill to State. Select that column and right click to go to the

properties. Click on Item Class and select the Item class created in step 3.