Freegoods

Hi Guys,

I have a Question regarding free goods,

In the creation of sales order i am giving the two materials like p-10 and Qty 100 , material p-11 and qty 100 for the combination if qty is equally to 200 , the customer get the price for 199 and get the free goods for 1.

May be it is not possible in the standand SAP one more than material combination, it is possible through route or BADI , please let me know the process

Regards,

Rajasekhar