Free of goods should come automatically back when creates return sales order

Dear sd experts

I Know one thing that free goods wont come back ,, for ex when we create return sales order free goods wont come bz in VTAF copy requirement 302

it means dont copy free goods

Now i went VOV7--- for item category TANN-- i have maintained billing relevance A it means free goods items will come in to billing

now when i am creating return sales order with reference to billing Free goods are not coming

              My doubt is suppose if  my clinte asks free goods   will come automatically when creates returns how to do it ?