Is there a functionality to print the bill of material of a product in the invoice ?

Hello, In OpenERP 7, I want to add the components( products) of a manufactured product to the invoice line. If the product is manufactured, then all its components will be listed below (see PC), else , a simple invoice line will be printed ( see flash disc). I am going to develop a module which will do that but I am asking if there is already a functionality which do that ? Per example : Item Number Price Sum --------------------------------------------------------------------------- PC 1 500 £ 500 £ 1 hard disc 2 ram ships 1 mouse 2 speakers ------------------------------------------------------------------------ flash disc 2 5£ 10£