Hi Patra
We will maintain relation with X & Y somewhere in system.
Basically need is with one mobile Handset business wants to give one Flip cover free.
We are able to achieve the same in sales through Free Goods concept by maintaining in VBN1.
But now SCM team wants while transferring stock from Mother Warehouse(one Plant) to CFA(another plant in same company code) flip cover code should automatically come in stock transfer Purchase order like it is coming in sales order created from CFA to Customer.
Here you can say X is mobile and Y is flip Cover.
Hope it is clear now
Regards
RK