eventespresso / event-espresso-core

            ));

            $ticket_line_item->add_child_line_item($cancellation_line_item);

        }

        if ($ticket_line_item->save_this_and_descendants() > 0) {

            // decrement parent line item quantity

            $event_line_item = $ticket_line_item->parent();

            if ($event_line_item instanceof EE_Line_Item

                && $event_line_item->OBJ_type() === EEM_Line_Item::OBJ_TYPE_EVENT

            ) {

                $event_line_item->set_quantity($event_line_item->quantity() - $qty);

                $event_line_item->save();

            }

            EEH_Line_Item::get_grand_total_and_recalculate_everything($ticket_line_item);

            return true;

        }

        return false;

    }

        }

        // increment ticket quantity

        $ticket_line_item->set_quantity($ticket_line_item->quantity() + $qty);

        if ($ticket_line_item->save_this_and_descendants() > 0) {

            // increment parent line item quantity

            $event_line_item = $ticket_line_item->parent();

            if ($event_line_item instanceof EE_Line_Item

                && $event_line_item->OBJ_type() === EEM_Line_Item::OBJ_TYPE_EVENT

            ) {

                $event_line_item->set_quantity($event_line_item->quantity() + $qty);

            }

            EEH_Line_Item::get_grand_total_and_recalculate_everything($ticket_line_item);

            return true;

        }

        return false;

    }