movement type 415 Q with split valuation?

In my system(4.7C), with movement type 415 Q, user can give any valuation type in the destination field even thought the valuation type is not exist. Is this sap standard function that 415 Q works like this? (I'm not sure on this since there are so many user exit are used). I checked also 311 Q, no check for destination valuation type either. I did not find any good document in notes. can anyone tell me if this is the sap standard funtion? how to prevent user give valuation type not exist? thanks a lot.