Copy room feature doesn't show cost

Not sure if this is a bug, or if the game was designed like this but here goes: I tried to use the copy room feature in build mode. I couldn't copy the room because the game stated I had insufficient funds, however not how much I would need to copy the room. When there are sufficient funds available and you try to copy a room, only then it will show you the actual needed funds to copy the room. I'm not sure how popular this function is, but it would be easier to display the necessary funds even if the sim doesn't currently have the funds.