Confirmation control key for Return STO

Hi Gurus,

For STO thru the below configuration i am able to populate the Confirmation control key in STO PO.Now the requirement is to populate the Confirmation control key for returns STO.Is there any configuration option or is it possible to achive thru any user exit.

SPRO -> Logistics Execution -> Shipping -> Deliveries -> Define Order Confrmations for Inbound Deliveries.

For Purchasing Doc Cat / Doc Type (UB) / Plant / Sloc you can enter the CCK here.