custom defaulting rule with pl/sql is not working

I have set up defaulting rule as picture and pl/sql below.

The function keep return XXNO_VALUE when I go to create sale order.

It seems  ONT_HEADER_DEF_HDLR.g_record.SOLD_TO_ORG_ID is return no value. This is on EBS R12.2.3

Any suggestion please help.

CREATE OR REPLACE PACKAGE BODY APPS.viv_oe_default_pkg IS

FUNCTION get_invoice_comments

         ( p_database_object_name       IN  VARCHAR2

            ,p_attribute_code   IN  VARCHAR2)

RETURN varchar2 IS

l_header_id         NUMBER;

l_invoice_to_org_id number;

l_sold_to_org_rec     OE_Order_Cache.Sold_To_Org_Rec_Type;