First, find the name of the table or view that the form uses (Help | Record History).  This will display either the exact table name or the view being used by the form.  

Display either the exact table name or the view being used by the form

Next, look for the table name in Application Developer (Flexfield | Descriptive | Register). Since DFF are registered to Tables and not Views, drop the ‘_v’ from the end of the table name, if there is one.  This denotes that it is a view.  

Now go to the Segments themselves, and use the DFF Name to query it up.  Note that this is not the TITLE that appears on the window, but the DESCRIPTIVE_FLEXFIELD_NAME.  To search on a field that is not displayed on the form, refer to:

To search on a field that is not displayed on the form

• F11 to enter query mode
• Help | Diagnostics | Examine (setting the profile Utilities: Diagnostics will allow access to this without the APPS password)
• Select the Field Descriptive_Flexfield_Value
• Enter the actual value found in the Register form
• Select OK then Control F11

Once you find the DFF, it can be enabled and setup.  Typically, DFF will have 15 columns available. Two tips to ensure this is setup to be User Friendly:  first, do not display the Context if it is not needed, and do not REQUIRE a segment if it is not going to be populated on every record.  

Contributed by Melanie Cameron, MSS Tech, Author of Oracle General Ledger and Oracle Procure to Pay.