How to use Descriptive Flex Fields (DFF) in forms

Implementing DFF in Form consist of two steps Process. The first steps consist of designing the table structure and registration and step 2 consist of enabling in the form.
Steps 1:
Define DFF fields in the custom tables
ATTRIBUTE1…ATTRIBUTE15 and ATTRIBUTE_CATEGORY are the normal fields used for DFF
Register the table with Oracle AOL
Register the DFF with Oracle AOL
For this you have to login into application with :
Application Developer -> Flex Field -> Descriptive -> Register
Then you should specify the name of the DFF (Say BTL_AR_DFF) and specify the associated table.
Step 2:
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Create DFF fields in the custom form
1. Create a form based on the custom table
Copy TEMPLATE form has example descriptive flexfield which we can use
Use the TEXT_ITEM_DESC_FLEX property class
Attach ENABLE_LIST_LAMP_LOV for the field
2. Create a non-base table text item in the block with property class TEXT_ITEM_DESC_FLEX3. Make sure that DFF is mapped to fields (ATTRIBUTE) of the table and is enabled.
Next is to call Flexfield Routines to add DFF built-ins in the form to invoke DFF.
This consist of these steps:
1. Write, a form level trigger WHEN-NEW-FORM-INSTANCE to invoke the DFF as
FND_DESCR_FLEX.DEFINE(Block => ‘Name of the DFF block’,Field => ‘BTL_DFF’,Appl_short_name => ‘AR’,Desc_flex_name => ‘BTL_AR_DFF’,Title => ‘BPL AR More Info’ );
2. Write, block level triggers PRE-QUERY and POST-QUERY as
FND_FLEX.EVENT(’PRE-QUERY’);
FND_FLEX.EVENT(’POST-QUERY’);
FND_FLEX.EVENT(’Pre-Query’);
FND_FLEX.EVENT(’When-Validate-Record’);
FND_FLEX.EVENT(’Post-Query’);
FND_FLEX.EVENT(’When-New-Item-Instance’);
FND_FLEX.EVENT(’Pre-Insert’);
FND_FLEX.EVENT(’When-Validate-Item’);
FND_FLEX.EVENT(’Pre-Update ‘);