Narendra,
You need to create two orders, and ineach of these orders, you can have line items for KLN and for RENN respectively i.e. one order can not have both line items.
With KLN you want to send goods to the customer and with RENN you want to get the goods from customer back to your company; this cannot be included in one order.
There are different sales document types for each of these. Each of these order types have a different SD document category and this doesnot permit to combine both.
TW