How to create user defined Lot number for a item using API

Hi
I have to create lot number for a item using API.

I am using Below Script

mo_global.set_policy_context ('S', 0);
   -- mo_global.init('INV');

    -- Initialization for Organization_id
    inv_globals.set_org_id (0);

-- initialize environment
    fnd_global.apps_initialize (user_id => 10635,
    resp_id => 20634,
    resp_appl_id => 401);

    inv_lot_api_pub.insertlot
            (p_api_version => 1,
            p_init_msg_list => fnd_api.g_true,
            p_commit => fnd_api.g_false,
            p_validation_level => fnd_api.g_valid_level_full,
            p_inventory_item_id =>69436,
            p_organization_id => 366
            p_lot_number =>'12345',
            p_expiration_date =>null,
            x_object_id => x_object_id,