Automate transact and ship confirm-fail

Question

we want to automate transact and ship confirm using API. when we test the API separately, it works fine.
when we put them together, when after transact, we will can the ship confirm, it failed at ship confirmed.(transact looks success and the serial number is moved to staging locator)
the syndrome is, the order line is awaiting fulfillment/close (ie: successfully ship confirmed), but the transaction is pending at transaction open interface with
missing serial numbers (no record found in mtl_serial_numbers_temp)
what could be the problem?? is it any missing steps?
we are using this API to do transact
inv_pick_wave_pick_confirm_pub.pick_confirm
and we use this to do ship confirm
wsh_deliveries_pub.delivery_action
p_api_version_number => 1.0,
p_init_msg_list => fnd_api.g_true,
x_return_status => out_ship_return_status,
x_msg_count => out_ship_msg_count,
x_msg_data => out_ship_msg_data,
p_action_code => 'CONFIRM',
p_delivery_id => p_delivery_id,
--p_sc_trip_ship_method => p_ship_method_code, 
p_sc_action_flag => 'S',
p_sc_intransit_flag => 'Y',
p_sc_close_trip_flag => 'Y',
p_sc_create_bol_flag => 'N',
p_sc_stage_del_flag => 'Y',
p_sc_defer_interface_flag => 'N',
x_trip_id => out_trip_id,
x_trip_name => out_trip_name
);

Answer 1

UPDATE APPS.MTL_SERIAL_NUMBERS
SET group_mark_id = p_transaction_temp_id,
line_mark_id = p_transaction_temp_id,
lot_line_mark_id = p_transaction_temp_id
WHERE serial_number >= p_fm_serial_number
and serial_number <= p_to_serial_number;