ONT_header_Def_Hdlr.g_record.order_type_id is not populated in R12

 Hi,

We are upgrading from 11i to R12. We have an Defaulting Rule for Order Management - Order Header to default the order type id and ship_to_orgid.   this rule calls a PL/SQL API determines the subinventory(custom package).  But it is not returning the subinventory. In that package we assigned the variables as below 

p_order_type_id     := ONT_header_Def_Hdlr.g_record.order_type_id;

p_inventory_item_id    := ONT_line_Def_Hdlr.g_record.inventory_item_id;

p_source_document_id := ONT_line_Def_Hdlr.g_record.source_document_id;

 As per my understanding the above variables which is not assigning the any values.