11.5.10 AP Invoice Approval AME how to filled REQUESTER_ID field

Hello Oracle

I would like to ask you if you can help me how to assign automatically the value

REQUESTER_ID

I have the following personalization but is not working

Trigger = WHEN-VALIDATE-RECORD

Trigger Object = INV_SUM_FOLDER

Condition

:INV_SUM_FOLDER.REQUESTER_ID is null

OR

:INV_SUM_FOLDER.REQUESTER_NAME is null

Actions

Property

item

Target Object : INV_SUM_FOLDER.REQUESTER_NAME

Property Name VALUE

Value

=select full_name from per_all_people_f

where person_id = (select employee_id from FND_USER

where user_id = :INV_SUM_FOLDER.CREATED_BY)

and sysdate between effective_start_date and effective_end_date