Hi Roopendra
Please check below table can be helpful to pull wpt for OBD and satisfy your need.
Outbound Delivery Item
/SCDL/DB_DLVI_O
but in PPF action setting you can put condition and with WPT.
there is one more way can you make new delivery document type with and give your new action profile which has automatic setting for WPT.
Regards
Suraj